diff --git a/build.xml b/build.xml
index a4ee470d..e0ea7f0d 100644
--- a/build.xml
+++ b/build.xml
@@ -82,17 +82,21 @@
 			<pathelement path="lib/mmapi.jar"/>
 		</path>
 		<javac destdir="build/jme/classes" encoding="utf-8" source="1.3" target="1.2" bootclasspathref="wtk-libs"
+		    debug="on"
 			srcdir="build/jme/src"/>
 		<javac destdir="build/jse/classes" encoding="utf-8" source="1.3" target="1.3"
 			classpath="lib/bcel-5.2.jar"
+			debug="on"
 			srcdir="build/jse/src"
 			excludes="**/script/*,**/Lua2Java*,**/server/*,lua*"/>
 		<javac destdir="build/jse/classes" encoding="utf-8" source="1.5" target="1.5"
 			classpath="build/jse/classes"
+			debug="on"
 			srcdir="build/jse/src"
 			includes="**/script/*,**/Lua2Java*,**/server/*"/>
 		<javac destdir="build/jse/classes" encoding="utf-8" source="1.3" target="1.3"
 			classpath="build/jse/classes"
+			debug="on"
 			srcdir="build/jse/src"
 			includes="lua*"/>
 	</target>