diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/Issue590Test.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/Issue590Test.java
index 2ca636358..9e6ecdf33 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/Issue590Test.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/Issue590Test.java
@@ -39,8 +39,7 @@ public class Issue590Test {
     @ExpectedCompilationOutcome(value = CompilationResult.FAILED,
         diagnostics = { @Diagnostic(type = SourceTargetMapper.class,
             kind = Kind.ERROR,
-            line = 34,
-            messageRegExp = "Can't map property \"[^ ]+ [^\"]+\" to \"[^ ]+ [^\"]+\"") })
+            messageRegExp = "Can't map property \"java\\.lang\\.String prop\" to \"[^ ]+ prop\"") })
     public void showsCantMapPropertyError() {
 
     }
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/SourceTargetMapper.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/SourceTargetMapper.java
index 73ca00d93..107ed2af9 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/SourceTargetMapper.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_590/SourceTargetMapper.java
@@ -18,6 +18,8 @@
  */
 package org.mapstruct.ap.test.bugs._590;
 
+import java.util.logging.XMLFormatter;
+
 import org.mapstruct.Mapper;
 import org.mapstruct.MappingTarget;
 import org.mapstruct.ReportingPolicy;
@@ -50,13 +52,13 @@ public abstract class SourceTargetMapper {
     }
 
     public static class Target {
-        private StringBuilder prop;
+        private XMLFormatter prop;
 
-        public StringBuilder getProp() {
+        public XMLFormatter getProp() {
             return prop;
         }
 
-        public void setProp(StringBuilder prop) {
+        public void setProp(XMLFormatter prop) {
             this.prop = prop;
         }
     }