diff --git a/processor/src/main/java/org/mapstruct/ap/internal/model/PropertyMapping.java b/processor/src/main/java/org/mapstruct/ap/internal/model/PropertyMapping.java
index c83f85658..f17ab9ddb 100644
--- a/processor/src/main/java/org/mapstruct/ap/internal/model/PropertyMapping.java
+++ b/processor/src/main/java/org/mapstruct/ap/internal/model/PropertyMapping.java
@@ -558,11 +558,17 @@ public class PropertyMapping extends ModelElement {
 
             // parameter reference
             if ( propertyEntry == null ) {
-                return new SourceRHS( sourceParam.getName(),
-                                      sourceParam.getType(),
-                                      existingVariableNames,
-                                      sourceReference.toString()
+                SourceRHS sourceRHS = new SourceRHS(
+                    sourceParam.getName(),
+                    sourceParam.getType(),
+                    existingVariableNames,
+                    sourceReference.toString()
                 );
+                sourceRHS.setSourcePresenceCheckerReference( getSourcePresenceCheckerRef(
+                    sourceReference,
+                    sourceRHS
+                ) );
+                return sourceRHS;
             }
             // simple property
             else if ( !sourceReference.isNested() ) {
diff --git a/processor/src/test/java/org/mapstruct/ap/test/conditional/expression/ConditionalExpressionTest.java b/processor/src/test/java/org/mapstruct/ap/test/conditional/expression/ConditionalExpressionTest.java
index 60179cdea..42219cfb6 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/conditional/expression/ConditionalExpressionTest.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/conditional/expression/ConditionalExpressionTest.java
@@ -74,6 +74,43 @@ public class ConditionalExpressionTest {
         assertThat( target.getValue() ).isEqualTo( 0 );
     }
 
+    @ProcessorTest
+    @WithClasses({
+        ConditionalWithSourceToTargetExpressionMapper.class
+    })
+    @IssueKey("2666")
+    public void conditionalExpressionForSourceToTarget() {
+        ConditionalWithSourceToTargetExpressionMapper mapper = ConditionalWithSourceToTargetExpressionMapper.INSTANCE;
+
+        ConditionalWithSourceToTargetExpressionMapper.OrderDTO orderDto =
+            new ConditionalWithSourceToTargetExpressionMapper.OrderDTO();
+
+        ConditionalWithSourceToTargetExpressionMapper.Order order = mapper.convertToOrder( orderDto );
+        assertThat( order ).isNotNull();
+        assertThat( order.getCustomer() ).isNull();
+
+        orderDto = new ConditionalWithSourceToTargetExpressionMapper.OrderDTO();
+        orderDto.setCustomerName( "Tester" );
+        order = mapper.convertToOrder( orderDto );
+
+        assertThat( order ).isNotNull();
+        assertThat( order.getCustomer() ).isNotNull();
+        assertThat( order.getCustomer().getName() ).isEqualTo( "Tester" );
+        assertThat( order.getCustomer().getAddress() ).isNull();
+
+        orderDto = new ConditionalWithSourceToTargetExpressionMapper.OrderDTO();
+        orderDto.setLine1( "Line 1" );
+        order = mapper.convertToOrder( orderDto );
+
+        assertThat( order ).isNotNull();
+        assertThat( order.getCustomer() ).isNotNull();
+        assertThat( order.getCustomer().getName() ).isNull();
+        assertThat( order.getCustomer().getAddress() ).isNotNull();
+        assertThat( order.getCustomer().getAddress().getLine1() ).isEqualTo( "Line 1" );
+        assertThat( order.getCustomer().getAddress().getLine2() ).isNull();
+
+    }
+
     @ProcessorTest
     @ExpectedCompilationOutcome(
         value = CompilationResult.FAILED,
diff --git a/processor/src/test/java/org/mapstruct/ap/test/conditional/expression/ConditionalWithSourceToTargetExpressionMapper.java b/processor/src/test/java/org/mapstruct/ap/test/conditional/expression/ConditionalWithSourceToTargetExpressionMapper.java
new file mode 100644
index 000000000..c32fe99e0
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/conditional/expression/ConditionalWithSourceToTargetExpressionMapper.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.conditional.expression;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.factory.Mappers;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper(imports = ConditionalWithSourceToTargetExpressionMapper.Util.class)
+public interface ConditionalWithSourceToTargetExpressionMapper {
+
+    ConditionalWithSourceToTargetExpressionMapper INSTANCE =
+        Mappers.getMapper( ConditionalWithSourceToTargetExpressionMapper.class );
+
+    @Mapping(source = "orderDTO", target = "customer",
+        conditionExpression = "java(Util.mapCustomerFromOrder( orderDTO ))")
+    Order convertToOrder(OrderDTO orderDTO);
+
+    @Mapping(source = "customerName", target = "name")
+    @Mapping(source = "orderDTO", target = "address",
+        conditionExpression = "java(Util.mapAddressFromOrder( orderDTO ))")
+    Customer convertToCustomer(OrderDTO orderDTO);
+
+    Address convertToAddress(OrderDTO orderDTO);
+
+    class OrderDTO {
+
+        private String customerName;
+        private String line1;
+        private String line2;
+
+        public String getCustomerName() {
+            return customerName;
+        }
+
+        public void setCustomerName(String customerName) {
+            this.customerName = customerName;
+        }
+
+        public String getLine1() {
+            return line1;
+        }
+
+        public void setLine1(String line1) {
+            this.line1 = line1;
+        }
+
+        public String getLine2() {
+            return line2;
+        }
+
+        public void setLine2(String line2) {
+            this.line2 = line2;
+        }
+
+    }
+
+    class Order {
+
+        private Customer customer;
+
+        public Customer getCustomer() {
+            return customer;
+        }
+
+        public void setCustomer(Customer customer) {
+            this.customer = customer;
+        }
+    }
+
+    class Customer {
+        private String name;
+        private Address address;
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public Address getAddress() {
+            return address;
+        }
+
+        public void setAddress(Address address) {
+            this.address = address;
+        }
+    }
+
+    class Address {
+
+        private String line1;
+        private String line2;
+
+        public String getLine1() {
+            return line1;
+        }
+
+        public void setLine1(String line1) {
+            this.line1 = line1;
+        }
+
+        public String getLine2() {
+            return line2;
+        }
+
+        public void setLine2(String line2) {
+            this.line2 = line2;
+        }
+    }
+
+    interface Util {
+
+        static boolean mapCustomerFromOrder(OrderDTO orderDTO) {
+            return orderDTO != null && ( orderDTO.getCustomerName() != null || mapAddressFromOrder( orderDTO ) );
+        }
+
+        static boolean mapAddressFromOrder(OrderDTO orderDTO) {
+            return orderDTO != null && ( orderDTO.getLine1() != null || orderDTO.getLine2() != null );
+        }
+
+    }
+
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/conditional/qualifier/ConditionalMethodWithSourceToTargetMapper.java b/processor/src/test/java/org/mapstruct/ap/test/conditional/qualifier/ConditionalMethodWithSourceToTargetMapper.java
new file mode 100644
index 000000000..35864fe62
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/conditional/qualifier/ConditionalMethodWithSourceToTargetMapper.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.conditional.qualifier;
+
+import org.mapstruct.Condition;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.Named;
+import org.mapstruct.factory.Mappers;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper
+public interface ConditionalMethodWithSourceToTargetMapper {
+
+    ConditionalMethodWithSourceToTargetMapper INSTANCE =
+        Mappers.getMapper( ConditionalMethodWithSourceToTargetMapper.class );
+
+    @Mapping(source = "orderDTO", target = "customer", conditionQualifiedByName = "mapCustomerFromOrder")
+    Order convertToOrder(OrderDTO orderDTO);
+
+    @Mapping(source = "customerName", target = "name")
+    @Mapping(source = "orderDTO", target = "address", conditionQualifiedByName = "mapAddressFromOrder")
+    Customer convertToCustomer(OrderDTO orderDTO);
+
+    Address convertToAddress(OrderDTO orderDTO);
+
+    @Condition
+    @Named("mapCustomerFromOrder")
+    default boolean mapCustomerFromOrder(OrderDTO orderDTO) {
+        return orderDTO != null && ( orderDTO.getCustomerName() != null || mapAddressFromOrder( orderDTO ) );
+    }
+
+    @Condition
+    @Named("mapAddressFromOrder")
+    default boolean mapAddressFromOrder(OrderDTO orderDTO) {
+        return orderDTO != null && ( orderDTO.getLine1() != null || orderDTO.getLine2() != null );
+    }
+
+    class OrderDTO {
+
+        private String customerName;
+        private String line1;
+        private String line2;
+
+        public String getCustomerName() {
+            return customerName;
+        }
+
+        public void setCustomerName(String customerName) {
+            this.customerName = customerName;
+        }
+
+        public String getLine1() {
+            return line1;
+        }
+
+        public void setLine1(String line1) {
+            this.line1 = line1;
+        }
+
+        public String getLine2() {
+            return line2;
+        }
+
+        public void setLine2(String line2) {
+            this.line2 = line2;
+        }
+
+    }
+
+    class Order {
+
+        private Customer customer;
+
+        public Customer getCustomer() {
+            return customer;
+        }
+
+        public void setCustomer(Customer customer) {
+            this.customer = customer;
+        }
+    }
+
+    class Customer {
+        private String name;
+        private Address address;
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public Address getAddress() {
+            return address;
+        }
+
+        public void setAddress(Address address) {
+            this.address = address;
+        }
+    }
+
+    class Address {
+
+        private String line1;
+        private String line2;
+
+        public String getLine1() {
+            return line1;
+        }
+
+        public void setLine1(String line1) {
+            this.line1 = line1;
+        }
+
+        public String getLine2() {
+            return line2;
+        }
+
+        public void setLine2(String line2) {
+            this.line2 = line2;
+        }
+    }
+
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/conditional/qualifier/ConditionalQualifierTest.java b/processor/src/test/java/org/mapstruct/ap/test/conditional/qualifier/ConditionalQualifierTest.java
index 5d13787e6..69c9a048c 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/conditional/qualifier/ConditionalQualifierTest.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/conditional/qualifier/ConditionalQualifierTest.java
@@ -86,4 +86,41 @@ public class ConditionalQualifierTest {
         assertThat( employee.getNin() ).isNull();
         assertThat( employee.getSsid() ).isNull();
     }
+
+    @ProcessorTest
+    @WithClasses({
+        ConditionalMethodWithSourceToTargetMapper.class
+    })
+    @IssueKey("2666")
+    public void conditionalQualifiersForSourceToTarget() {
+        ConditionalMethodWithSourceToTargetMapper mapper = ConditionalMethodWithSourceToTargetMapper.INSTANCE;
+
+        ConditionalMethodWithSourceToTargetMapper.OrderDTO orderDto =
+            new ConditionalMethodWithSourceToTargetMapper.OrderDTO();
+
+        ConditionalMethodWithSourceToTargetMapper.Order order = mapper.convertToOrder( orderDto );
+        assertThat( order ).isNotNull();
+        assertThat( order.getCustomer() ).isNull();
+
+        orderDto = new ConditionalMethodWithSourceToTargetMapper.OrderDTO();
+        orderDto.setCustomerName( "Tester" );
+        order = mapper.convertToOrder( orderDto );
+
+        assertThat( order ).isNotNull();
+        assertThat( order.getCustomer() ).isNotNull();
+        assertThat( order.getCustomer().getName() ).isEqualTo( "Tester" );
+        assertThat( order.getCustomer().getAddress() ).isNull();
+
+        orderDto = new ConditionalMethodWithSourceToTargetMapper.OrderDTO();
+        orderDto.setLine1( "Line 1" );
+        order = mapper.convertToOrder( orderDto );
+
+        assertThat( order ).isNotNull();
+        assertThat( order.getCustomer() ).isNotNull();
+        assertThat( order.getCustomer().getName() ).isNull();
+        assertThat( order.getCustomer().getAddress() ).isNotNull();
+        assertThat( order.getCustomer().getAddress().getLine1() ).isEqualTo( "Line 1" );
+        assertThat( order.getCustomer().getAddress().getLine2() ).isNull();
+
+    }
 }