diff --git a/lisp/org-pcomplete.el b/lisp/org-pcomplete.el
index 062f38a7c..0c2b647f3 100644
--- a/lisp/org-pcomplete.el
+++ b/lisp/org-pcomplete.el
@@ -64,6 +64,7 @@
 (defvar org-outline-regexp)
 (defvar org-property-re)
 (defvar org-startup-options)
+(defvar org-tag-re)
 (defvar org-time-stamp-formats)
 (defvar org-todo-keywords-1)
 (defvar org-todo-line-regexp)