diff --git a/lisp/gnus/gnus-fun.el b/lisp/gnus/gnus-fun.el
index c95449762e..2461fd45fd 100644
--- a/lisp/gnus/gnus-fun.el
+++ b/lisp/gnus/gnus-fun.el
@@ -205,11 +205,12 @@ gnus-face-encode
 (defun gnus-convert-face-to-png (face)
   "Convert FACE (which is base64-encoded) to a PNG.
 The PNG is returned as a string."
-  (mm-with-unibyte-buffer
-    (insert face)
-    (ignore-errors
-      (base64-decode-region (point-min) (point-max)))
-    (buffer-string)))
+  (let ((face (gnus-base64-repad face)))
+    (mm-with-unibyte-buffer
+      (insert face)
+      (ignore-errors
+	(base64-decode-region (point-min) (point-max)))
+      (buffer-string))))
 
 ;;;###autoload
 (defun gnus-convert-png-to-face (file)