diff --git a/build.xml b/build.xml
index 6b93808323..8c4b75a598 100644
--- a/build.xml
+++ b/build.xml
@@ -223,7 +223,7 @@ Do you want to continue?</input>
     </path>
 
     <mkdir dir="bootstrap/target/classes" />
-    <javac destdir="bootstrap/target/classes" encoding="UTF-8" source="1.5" target="1.5" debug="true" includeAntRuntime="false">
+    <javac destdir="bootstrap/target/classes" encoding="UTF-8" source="1.6" target="1.6" debug="true" includeAntRuntime="false">
       <src refid="sources" />
       <classpath refid="pom.pathid" />
     </javac>