diff --git a/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper1.java b/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper1.java
index 6d303d644..985ac1b72 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper1.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper1.java
@@ -33,6 +33,7 @@ public interface ErroneousMapper1 {
 
     @Mappings({
         @Mapping(target = "stringConstant", constant = "stringConstant"),
+        @Mapping(target = "emptyStringConstant", constant = ""),
         @Mapping(source = "test", target = "integerConstant", constant = "14"),
         @Mapping(target = "longWrapperConstant", constant = "3001"),
         @Mapping(target = "dateConstant", dateFormat = "dd-MM-yyyy", constant = "09-01-2014"),
diff --git a/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper3.java b/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper3.java
index 95bf1f7e8..c5705480b 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper3.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper3.java
@@ -33,6 +33,7 @@ public interface ErroneousMapper3 {
 
     @Mappings({
         @Mapping(target = "stringConstant", constant = "stringConstant"),
+        @Mapping(target = "emptyStringConstant", constant = ""),
         @Mapping(target = "integerConstant", expression = "java('test')", constant = "14"),
         @Mapping(target = "longWrapperConstant", constant = "3001"),
         @Mapping(target = "dateConstant", dateFormat = "dd-MM-yyyy", constant = "09-01-2014"),
diff --git a/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper4.java b/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper4.java
index 1017cf4fa..83db59548 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper4.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/source/constants/ErroneousMapper4.java
@@ -33,6 +33,7 @@ public interface ErroneousMapper4 {
 
     @Mappings({
         @Mapping(target = "stringConstant", constant = "stringConstant"),
+        @Mapping(target = "emptyStringConstant", constant = ""),
         @Mapping(source = "test", target = "integerConstant", expression = "java('test')"),
         @Mapping(target = "longWrapperConstant", constant = "3001"),
         @Mapping(target = "dateConstant", dateFormat = "dd-MM-yyyy", constant = "09-01-2014"),
diff --git a/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceConstantsTest.java b/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceConstantsTest.java
index 6fd21c413..64cc7179a 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceConstantsTest.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceConstantsTest.java
@@ -22,6 +22,7 @@ import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.Date;
+
 import javax.tools.Diagnostic.Kind;
 
 import org.junit.Test;
@@ -60,6 +61,7 @@ public class SourceConstantsTest {
         assertThat( target ).isNotNull();
         assertThat( target.getPropertyThatShouldBeMapped() ).isEqualTo( "SomeProperty" );
         assertThat( target.getStringConstant() ).isEqualTo( "stringConstant" );
+        assertThat( target.getEmptyStringConstant() ).isEqualTo( "" );
         assertThat( target.getIntegerConstant() ).isEqualTo( 14 );
         assertThat( target.getLongWrapperConstant() ).isEqualTo( new Long( 3001L ) );
         assertThat( target.getDateConstant() ).isEqualTo( getDate( "dd-MM-yyyy", "09-01-2014" ) );
@@ -97,12 +99,12 @@ public class SourceConstantsTest {
         diagnostics = {
             @Diagnostic(type = ErroneousMapper1.class,
                 kind = Kind.ERROR,
-                line = 41,
+                line = 42,
                 messageRegExp = "Source and constant are both defined in @Mapping, either define a source or a "
                     + "constant"),
             @Diagnostic(type = ErroneousMapper1.class,
                 kind = Kind.WARNING,
-                line = 41,
+                line = 42,
                 messageRegExp = "Unmapped target property: \"integerConstant\"")
         }
     )
@@ -122,13 +124,13 @@ public class SourceConstantsTest {
         diagnostics = {
             @Diagnostic(type = ErroneousMapper3.class,
                 kind = Kind.ERROR,
-                line = 41,
+                line = 42,
                 messageRegExp =
                     "Expression and constant are both defined in @Mapping, either define an expression or a "
                         + "constant"),
             @Diagnostic(type = ErroneousMapper3.class,
                 kind = Kind.WARNING,
-                line = 41,
+                line = 42,
                 messageRegExp = "Unmapped target property: \"integerConstant\"")
         }
     )
@@ -148,12 +150,12 @@ public class SourceConstantsTest {
         diagnostics = {
             @Diagnostic(type = ErroneousMapper4.class,
                 kind = Kind.ERROR,
-                line = 41,
+                line = 42,
                 messageRegExp = "Source and expression are both defined in @Mapping, either define a source or an "
                     + "expression"),
             @Diagnostic(type = ErroneousMapper4.class,
                 kind = Kind.WARNING,
-                line = 41,
+                line = 42,
                 messageRegExp = "Unmapped target property: \"integerConstant\"")
         }
     )
diff --git a/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceTargetMapper.java b/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceTargetMapper.java
index f675efd51..7526369d4 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceTargetMapper.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/source/constants/SourceTargetMapper.java
@@ -33,6 +33,7 @@ public interface SourceTargetMapper {
 
     @Mappings({
         @Mapping(target = "stringConstant", constant = "stringConstant"),
+        @Mapping(target = "emptyStringConstant", constant = ""),
         @Mapping(target = "integerConstant", constant = "14"),
         @Mapping(target = "longWrapperConstant", constant = "3001"),
         @Mapping(target = "dateConstant", dateFormat = "dd-MM-yyyy", constant = "09-01-2014"),
diff --git a/processor/src/test/java/org/mapstruct/ap/test/source/constants/Target.java b/processor/src/test/java/org/mapstruct/ap/test/source/constants/Target.java
index 6c494343e..2bb5dfbf9 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/source/constants/Target.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/source/constants/Target.java
@@ -29,6 +29,7 @@ public class Target {
 
     private String propertyThatShouldBeMapped;
     private String stringConstant;
+    private String emptyStringConstant;
     private int integerConstant;
     private Long longWrapperConstant;
     private Date dateConstant;
@@ -78,4 +79,12 @@ public class Target {
         return nameConstants;
     }
 
+    public String getEmptyStringConstant() {
+        return emptyStringConstant;
+    }
+
+    public void setEmptyStringConstant(String emptyStringConstant) {
+        this.emptyStringConstant = emptyStringConstant;
+    }
+
 }