diff --git a/lisp/ob-R.el b/lisp/ob-R.el
index dfb94a3d6..d06b98248 100644
--- a/lisp/ob-R.el
+++ b/lisp/ob-R.el
@@ -37,6 +37,7 @@
 (declare-function ess-eval-buffer "ext:ess-inf" (vis))
 (declare-function org-number-sequence "org-compat" (from &optional to inc))
 (declare-function org-remove-if-not "org" (predicate seq))
+(declare-function org-every "org" (pred seq))
 
 (defconst org-babel-header-args:R
   '((width		 . :any)