diff --git a/commons_groups.install b/commons_groups.install
index 1f74383..bf53fbc 100644
--- a/commons_groups.install
+++ b/commons_groups.install
@@ -104,4 +104,11 @@ function commons_groups_update_3108() {
   );
   features_revert($revert);
   return array();
-}
\ No newline at end of file
+}
+
+/**
+ * Enable module PrivateMsg.
+ */
+function commons_groups_update_3109() {
+  module_enable(array('privatemsg'));
+}