diff --git a/contrib/lisp/org-contacts.el b/contrib/lisp/org-contacts.el
index b6d9e50a7..fbdf0fcb7 100644
--- a/contrib/lisp/org-contacts.el
+++ b/contrib/lisp/org-contacts.el
@@ -41,6 +41,7 @@
 
 (eval-and-compile
   (require 'org))
+(require 'gnus-util)
 
 (defgroup org-contacts nil
   "Options concerning contacts management."
diff --git a/lisp/org-gnus.el b/lisp/org-gnus.el
index de8a00f13..8ae41eeb2 100644
--- a/lisp/org-gnus.el
+++ b/lisp/org-gnus.el
@@ -32,6 +32,7 @@
 ;;; Code:
 
 (require 'org)
+(require 'gnus-util)
 (eval-when-compile (require 'gnus-sum))
 
 ;; Declare external functions and variables