diff --git a/lisp/org-mobile.el b/lisp/org-mobile.el
index 54b6e037e..2d8a44e5a 100644
--- a/lisp/org-mobile.el
+++ b/lisp/org-mobile.el
@@ -459,6 +459,7 @@ agenda view showing the flagged items."
 			      ((stringp x) x)
 			      ((eq (car x) :startgroup) "{")
 			      ((eq (car x) :endgroup) "}")
+			      ((eq (car x) :grouptags) nil)
 			      ((eq (car x) :newline) nil)
 			      ((listp x) (car x))))
 		      def-tags))