diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..28a3ad86
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "uglifyjs"]
+	path = uglifyjs
+	url = https://github.com/mishoo/UglifyJS.git
diff --git a/uglifyjs b/uglifyjs
new file mode 160000
index 00000000..ef4d776a
--- /dev/null
+++ b/uglifyjs
@@ -0,0 +1 @@
+Subproject commit ef4d776aedee6cbc8959a8e76403b82523615d3a