--- a/mail/branding/nightly/jar.mn
+++ b/mail/branding/nightly/jar.mn
@@ -5,11 +5,11 @@
 
 messenger.jar:
 % content branding %content/branding/
   content/branding/about-background.png             (content/about-background.png)
   content/branding/about-logo.png                   (content/about-logo.png)
   content/branding/about-wordmark.png               (content/about-wordmark.png)
   content/branding/about.png                        (content/about.png)
   content/branding/icon48.png                       (default48.png)
-  content/branding/icon64.png                       (default48.png)
+  content/branding/icon64.png                       (default64.png)
   content/branding/aboutDialog.css                  (content/aboutDialog.css)
   ../classic/skin/classic/messenger/icons/new-mail-alert.png  (default48.png)

--- a/other-licenses/branding/thunderbird/jar.mn
+++ b/other-licenses/branding/thunderbird/jar.mn
@@ -1,12 +1,12 @@
 #filter substitution
 
 messenger.jar:
 % content branding %content/branding/
   content/branding/about-background.png             (content/about-background.png)
   content/branding/about-logo.png                   (content/about-logo.png)
   content/branding/about-wordmark.png               (content/about-wordmark.png)
   content/branding/about.png                        (content/about.png)
-  content/branding/icon48.png                       (mailicon48.png)
-  content/branding/icon64.png                       (mailicon64.png)
+  content/branding/icon48.png                       (default48.png)
+  content/branding/icon64.png                       (default64.png)
   content/branding/aboutDialog.css                  (content/aboutDialog.css)
-  ../classic/skin/classic/messenger/icons/new-mail-alert.png  (mailicon48.png)
+  ../classic/skin/classic/messenger/icons/new-mail-alert.png  (default48.png)