diff --git a/releng/org.eclipse.cdt.releng/windows/build.properties b/releng/org.eclipse.cdt.releng/windows/build.properties
index e01f24b529f..78a1e875323 100644
--- a/releng/org.eclipse.cdt.releng/windows/build.properties
+++ b/releng/org.eclipse.cdt.releng/windows/build.properties
@@ -89,7 +89,7 @@ javacDebugInfo=on
 javacfailonerror=true
 
 # The version of the source code
-javacSource=1.4
+javacSource=1.5
 
 # The version of the byte code targeted
-javacTarget=1.4
+javacTarget=1.5