diff --git a/src/gnome-shell-extension-tool.in b/src/gnome-shell-extension-tool.in
index e610b462f..8ec24fbef 100644
--- a/src/gnome-shell-extension-tool.in
+++ b/src/gnome-shell-extension-tool.in
@@ -148,5 +148,6 @@ use an extension title clicktofocus@janedoe.example.com.'''
         f.close()
 
     print "Created extension in %r" % (extension_path, )
+    extensionjs_path = os.path.join(extension_path, 'extension.js')
     subprocess.Popen(['gnome-open', extensionjs_path])
     sys.exit(0)