--- a/browser/base/content/browser-kde.xul
+++ b/browser/base/content/browser-kde.xul
@@ -209,7 +209,7 @@
       </row>
       <vbox id="editBookmarkPanelContent" flex="1" hidden="true"/>
       <hbox id="editBookmarkPanelBottomButtons" pack="end">
-#ifndef XP_UNIX
+#ifdef XP_UNIX
         <button id="editBookmarkPanelDoneButton"
                 class="editBookmarkPanelBottomButton"
                 label="&editBookmark.done.label;"