diff --git a/arduino-core/build.xml b/arduino-core/build.xml
index db709c3f8..6245ed6b5 100644
--- a/arduino-core/build.xml
+++ b/arduino-core/build.xml
@@ -37,6 +37,7 @@
            includeAntRuntime="false"
            srcdir="src"
            classpathref="class.path"
+           debug="true"
            destdir="bin">
     </javac>