diff --git a/js/ui/Makefile.am b/js/ui/Makefile.am
index c58d37b24..5ef241b57 100644
--- a/js/ui/Makefile.am
+++ b/js/ui/Makefile.am
@@ -10,6 +10,7 @@ dist_jsui_DATA =		\
 	dnd.js			\
 	docDisplay.js		\
 	environment.js		\
+	extensionSystem.js  \
 	genericDisplay.js	\
 	lightbox.js		\
 	link.js			\