diff --git a/mu4e/mu4e-view.el b/mu4e/mu4e-view.el
index 1e94ccab..9286da9b 100644
--- a/mu4e/mu4e-view.el
+++ b/mu4e/mu4e-view.el
@@ -1069,8 +1069,8 @@ The alist uniquely maps the number to the gnus-part."
       (while (not (eobp))
         (let ((part (get-text-property (point) 'gnus-data))
               (index (get-text-property (point) 'gnus-part)))
-          (when (and part (numberp index) (not (assoc index parts))
-            (push `(,index . ,part) parts)))
+          (when (and part (numberp index) (not (assoc index parts)))
+            (push `(,index . ,part) parts))
           (goto-char (or (next-single-property-change (point) 'gnus-part)
                          (point-max))))))
     parts))