diff --git a/processor/src/test/java/org/mapstruct/ap/test/conversion/date/DateConversionTest.java b/processor/src/test/java/org/mapstruct/ap/test/conversion/date/DateConversionTest.java
index 83464f81a..9ccf8e7e1 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/conversion/date/DateConversionTest.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/conversion/date/DateConversionTest.java
@@ -17,6 +17,7 @@ import org.junit.jupiter.api.condition.EnabledForJreRange;
 import org.junit.jupiter.api.condition.EnabledOnJre;
 import org.junit.jupiter.api.condition.JRE;
 import org.junitpioneer.jupiter.DefaultLocale;
+import org.junitpioneer.jupiter.ReadsDefaultTimeZone;
 import org.mapstruct.ap.testutil.IssueKey;
 import org.mapstruct.ap.testutil.ProcessorTest;
 import org.mapstruct.ap.testutil.WithClasses;
@@ -35,6 +36,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 })
 @IssueKey("43")
 @DefaultLocale("de")
+@ReadsDefaultTimeZone
 public class DateConversionTest {
 
     @ProcessorTest
diff --git a/processor/src/test/java/org/mapstruct/ap/test/naming/VariableNamingTest.java b/processor/src/test/java/org/mapstruct/ap/test/naming/VariableNamingTest.java
index 4b5c7982e..a8e833ee0 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/naming/VariableNamingTest.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/naming/VariableNamingTest.java
@@ -12,6 +12,7 @@ import java.util.GregorianCalendar;
 import java.util.HashMap;
 import java.util.Map;
 
+import org.junitpioneer.jupiter.ReadsDefaultTimeZone;
 import org.mapstruct.ap.testutil.IssueKey;
 import org.mapstruct.ap.testutil.ProcessorTest;
 import org.mapstruct.ap.testutil.WithClasses;
@@ -26,6 +27,7 @@ import static org.assertj.core.api.Assertions.entry;
  */
 @WithClasses({ SourceTargetMapper.class, While.class, Break.class, Source.class })
 @IssueKey("53")
+@ReadsDefaultTimeZone
 public class VariableNamingTest {
 
     @ProcessorTest
diff --git a/processor/src/test/java/org/mapstruct/ap/test/nestedmethodcall/NestedMappingMethodInvocationTest.java b/processor/src/test/java/org/mapstruct/ap/test/nestedmethodcall/NestedMappingMethodInvocationTest.java
index 8d600d860..03c47f7a4 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/nestedmethodcall/NestedMappingMethodInvocationTest.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/nestedmethodcall/NestedMappingMethodInvocationTest.java
@@ -17,6 +17,7 @@ import javax.xml.datatype.XMLGregorianCalendar;
 import javax.xml.namespace.QName;
 
 import org.junitpioneer.jupiter.DefaultLocale;
+import org.junitpioneer.jupiter.ReadsDefaultTimeZone;
 import org.mapstruct.ap.testutil.IssueKey;
 import org.mapstruct.ap.testutil.ProcessorTest;
 import org.mapstruct.ap.testutil.WithClasses;
@@ -31,6 +32,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @IssueKey("134")
 @DefaultLocale("de")
+@ReadsDefaultTimeZone
 public class NestedMappingMethodInvocationTest {
 
     public static final QName QNAME = new QName( "dont-care" );