diff --git a/rectangular-region-mode.el b/rectangular-region-mode.el
index 16b012b..cb84e04 100644
--- a/rectangular-region-mode.el
+++ b/rectangular-region-mode.el
@@ -57,6 +57,10 @@
   (rectangular-region-mode 0)
   (multiple-cursors-mode 1))
 
+(defadvice er/expand-region (before switch-from-rrm-to-mc activate)
+  (when rectangular-region-mode
+    (rrm/switch-to-multiple-cursors)))
+
 (define-minor-mode rectangular-region-mode
   "A mode for creating a rectangular region to edit"
   nil " rr" rectangular-region-mode-map