diff --git a/core/core-lib.el b/core/core-lib.el
index 3d2d27c29..e2290bc3d 100644
--- a/core/core-lib.el
+++ b/core/core-lib.el
@@ -169,7 +169,7 @@ at the values with which this function was called."
 This is a variadic `cl-pushnew'."
   (let ((var (make-symbol "result")))
     `(dolist (,var (list ,@values))
-       (cl-pushnew ,var ,place))))
+       (cl-pushnew ,var ,place :test #'equal))))
 
 (defmacro prependq! (sym &rest lists)
   "Prepend LISTS to SYM in place."