diff --git a/ox-rst.el b/ox-rst.el
index fd88be1..55ac15d 100644
--- a/ox-rst.el
+++ b/ox-rst.el
@@ -1072,7 +1072,7 @@ INFO is a plist holding contextual information."
 			(if (org-string-nw-p attr) (concat "\n" attr "\n") ""))))
     (cond
      ;; Link type is handled by a special function.
-     ((org-export-custom-protocol-maybe link desc info))
+     ((org-export-custom-protocol-maybe link desc 'rst))
      ;; Image file.
      ((and (plist-get info :rst-inline-images)
            (org-export-inline-image-p