diff --git a/user/build.xml b/user/build.xml
index df5fc64d07..3153cc893c 100755
--- a/user/build.xml
+++ b/user/build.xml
@@ -1,7 +1,7 @@
 <project name="user" default="build" basedir=".">
   <property name="gwt.root" location=".."/>
   <property name="project.tail" value="user"/>
-  <property name="test.args" value="-ea"/>
+  <property name="test.args" value="-ea -sourceLevel auto"/>
   <property name="test.jvmargs" value="-ea"/>
 
   <!-- support old variables names -->