--- a/browser/themes/shared/jar.inc.mn
+++ b/browser/themes/shared/jar.inc.mn
@@ -93,17 +93,19 @@
   skin/classic/browser/fxa/android.png                         (../shared/fxa/android.png)
   skin/classic/browser/fxa/android@2x.png                      (../shared/fxa/android@2x.png)
   skin/classic/browser/fxa/ios.png                             (../shared/fxa/ios.png)
   skin/classic/browser/fxa/ios@2x.png                          (../shared/fxa/ios@2x.png)
 
 
   skin/classic/browser/addons.svg                     (../shared/icons/addons.svg)
   skin/classic/browser/back.svg                       (../shared/icons/back.svg)
+#ifndef MOZ_PHOTON_THEME
   skin/classic/browser/back-large.svg                 (../shared/icons/back-large.svg)
+#endif
   skin/classic/browser/bookmark.svg                   (../shared/icons/bookmark.svg)
   skin/classic/browser/bookmark-hollow.svg            (../shared/icons/bookmark-hollow.svg)
   skin/classic/browser/bookmarksMenu.svg              (../shared/icons/bookmarksMenu.svg)
   skin/classic/browser/characterEncoding.svg          (../shared/icons/characterEncoding.svg)
   skin/classic/browser/chevron.svg                    (../shared/icons/chevron.svg)
   skin/classic/browser/containers.svg                       (../shared/icons/containers.svg)
   skin/classic/browser/developer.svg                  (../shared/icons/developer.svg)
   skin/classic/browser/download.svg                   (../shared/icons/download.svg)

--- a/browser/themes/shared/toolbarbutton-icons.inc.css
+++ b/browser/themes/shared/toolbarbutton-icons.inc.css
@@ -19,17 +19,21 @@ toolbar[brighttext] :-moz-any(@primaryTo
 #reload-button:-moz-locale-dir(rtl) > .toolbarbutton-icon,
 %endif
 #nav-bar-overflow-button:-moz-locale-dir(rtl) > .toolbarbutton-icon,
 #panic-button:-moz-locale-dir(rtl) > .toolbarbutton-icon {
   transform: scaleX(-1);
 }
 
 #back-button {
+%ifdef MOZ_PHOTON_THEME
+  list-style-image: url("chrome://browser/skin/back.svg");
+%else
   list-style-image: url("chrome://browser/skin/back-large.svg");
+%endif
 }
 
 #forward-button {
   list-style-image: url("chrome://browser/skin/forward.svg");
 }
 
 %ifdef MOZ_PHOTON_THEME
 #reload-button {