diff --git a/elfeed-summary.el b/elfeed-summary.el
index ac24eee..c1ff680 100644
--- a/elfeed-summary.el
+++ b/elfeed-summary.el
@@ -751,7 +751,7 @@ items."
     (replace-regexp-in-string
      (rx "?" (* not-newline) eos)
      ""
-     (elfeed-feed-url feed)))))
+     (elfeed-feed-id feed)))))
 
 (defun elfeed-summary--search-feed-notify (widget &rest _)
   "A function to run in `:notify' in a feed widget button.
@@ -796,7 +796,7 @@ SECTION is an instance of `elfeed-summary-group-section'."
              (format "=%s" (replace-regexp-in-string
                             (rx "?" (* not-newline) eos)
                             ""
-                            (elfeed-feed-url feed))))
+                            (elfeed-feed-id feed))))
            feeds
            " ")))))))