diff --git a/ant.properties b/ant.properties
index 59e99e856..7ddeeeb30 100644
--- a/ant.properties
+++ b/ant.properties
@@ -1,2 +1,3 @@
+source.dir=src:submodules/linphone/mediastreamer2/java/src:submodules/linphone/java/j2se:submodules/linphone/java/common:submodules/linphone/java/impl:submodules/linphone/coreapi/help/java
 key.store=bc-android.keystore
 key.alias=nw8000