diff --git a/application/palemoon/themes/osx/browser.css b/application/palemoon/themes/osx/browser.css
index 20e453d11c..68365162c4 100644
--- a/application/palemoon/themes/osx/browser.css
+++ b/application/palemoon/themes/osx/browser.css
@@ -96,10 +96,6 @@
     -moz-appearance: -moz-window-button-box;
 }
 
-#main-window[sizemode="maximized"] #titlebar-buttonbox {
-    -moz-appearance: -moz-window-button-box-maximized;
-}
-
 .titlebar-placeholder[type="appmenu-button"] {
     margin-left: 4px;
 }