diff --git a/modules/java/test/pure_test/build.xml b/modules/java/test/pure_test/build.xml
index 870dd44d74..e9b57fe34d 100644
--- a/modules/java/test/pure_test/build.xml
+++ b/modules/java/test/pure_test/build.xml
@@ -21,7 +21,7 @@
   <target name="compile">
     <mkdir dir="build/classes"/>
 
-    <javac sourcepath="" srcdir="src" destdir="build/classes" includeantruntime="false" >
+    <javac sourcepath="" srcdir="src" destdir="build/classes" debug="on" includeantruntime="false" >
       <include name="**/*.java"/>
       <classpath refid="master-classpath"/>
     </javac>