--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -570,17 +570,17 @@ pref("browser.gesture.swipe.up", "cmd_sc
 pref("browser.gesture.swipe.down", "cmd_scrollBottom");
 #ifdef XP_MACOSX
 pref("browser.gesture.pinch.latched", true);
 pref("browser.gesture.pinch.threshold", 150);
 #else
 pref("browser.gesture.pinch.latched", false);
 pref("browser.gesture.pinch.threshold", 25);
 #endif
-#ifdef XP_WIN
+#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
 // Enabled for touch input display zoom.
 pref("browser.gesture.pinch.out", "cmd_fullZoomEnlarge");
 pref("browser.gesture.pinch.in", "cmd_fullZoomReduce");
 pref("browser.gesture.pinch.out.shift", "cmd_fullZoomReset");
 pref("browser.gesture.pinch.in.shift", "cmd_fullZoomReset");
 #else
 // Disabled by default due to issues with track pad input.
 pref("browser.gesture.pinch.out", "");