diff --git a/lisp/gnus/gnus-html.el b/lisp/gnus/gnus-html.el
index 90814faeddd..174e128a7e9 100644
--- a/lisp/gnus/gnus-html.el
+++ b/lisp/gnus/gnus-html.el
@@ -508,7 +508,7 @@ Return a string with image data."
 (defun gnus-html-prefetch-images (summary)
   (when (buffer-live-p summary)
     (let (inhibit-images blocked-images)
-      (with-current-buffer summary-buffer
+      (with-current-buffer summary
 	(setq inhibit-images gnus-inhibit-images
 	      blocked-images (gnus-blocked-images)))
       (save-match-data