diff --git a/src/workgroups-workgroup.el b/src/workgroups-workgroup.el
index 5460a8db944325d5245ba4193dfbb8a5775266a7..0e880abcea7158bea81a06ba060a3543c6803905 100644
--- a/src/workgroups-workgroup.el
+++ b/src/workgroups-workgroup.el
@@ -9,6 +9,10 @@
 ;;
 ;; Variables
 ;;
+(defvar wg-deactivation-list nil
+  "A stack of workgroups that are currently being switched away from.
+Used to avoid associating the old workgroup's buffers with the
+new workgroup during a switch.")
 
 (defcustom wg-confirm-on-get-workgroup-create nil
   "Non-nil means request confirmation before creating a new