diff --git a/define-repeat-map.el b/define-repeat-map.el
index 1a8466f..69e8042 100644
--- a/define-repeat-map.el
+++ b/define-repeat-map.el
@@ -39,7 +39,7 @@
 (defun define-repeat-map--define-keys (map fn args)
   "Internal.  Map `define-key' in MAP over ARGS, transorming them with FN."
   (unless (zerop (mod (length args) 2))
-    (error "Wrong number of args"))
+    (signal 'wrong-number-of-arguments (length args)))
   (let (res)
     (while args
       (let ((key (pop args))