diff --git a/core.windows/src/org/netbeans/core/windows/view/ui/MainWindow.java b/core.windows/src/org/netbeans/core/windows/view/ui/MainWindow.java
--- a/core.windows/src/org/netbeans/core/windows/view/ui/MainWindow.java
+++ b/core.windows/src/org/netbeans/core/windows/view/ui/MainWindow.java
@@ -146,7 +146,7 @@
            }
            //#198639 - workaround for main menu & mouse issues in Gnome 3
            String session = System.getenv("DESKTOP_SESSION"); //NOI18N
-           if ("gnome-shell".equals(session) || "gnome".equals(session)) { //NOI18N
+           if ("gnome-shell".equals(session) || "gnome".equals(session) || "mate".equals(session)) { //NOI18N
                try {
                    Class<?> xwm = Class.forName("sun.awt.X11.XWM"); //NOI18N
                    Field awt_wmgr = xwm.getDeclaredField("awt_wmgr"); //NOI18N