diff --git a/core/core-lib.el b/core/core-lib.el
index 8ee68e8e4..27812766d 100644
--- a/core/core-lib.el
+++ b/core/core-lib.el
@@ -328,7 +328,7 @@ The current file is the file from which `add-to-load-path!' is used."
   `(let ((default-directory ,(dir!))
          file-name-handler-alist)
      (dolist (dir (list ,@dirs))
-       (cl-pushnew (expand-file-name dir) load-path))))
+       (cl-pushnew (expand-file-name dir) load-path :test #'string=))))
 
 (defmacro after! (package &rest body)
   "Evaluate BODY after PACKAGE have loaded.