diff --git a/hw/xquartz/X11Application.h b/hw/xquartz/X11Application.h
index bdbe6ac1f..56806867e 100644
--- a/hw/xquartz/X11Application.h
+++ b/hw/xquartz/X11Application.h
@@ -126,6 +126,7 @@ X11ApplicationMain(int argc, char **argv, char **envp);
 #define PREFS_APPKIT_MODIFIERS      "appkit_modifiers"
 #define PREFS_WINDOW_ITEM_MODIFIERS "window_item_modifiers"
 #define PREFS_ROOTLESS              "rootless"
+#define PREFS_RENDER_EXTENSION      "enable_render_extension"
 #define PREFS_TEST_EXTENSIONS       "enable_test_extensions"
 #define PREFS_XP_OPTIONS            "xp_options"
 #define PREFS_LOGIN_SHELL           "login_shell"
diff --git a/hw/xquartz/X11Application.m b/hw/xquartz/X11Application.m
index e091fbb3d..e1d35abbf 100644
--- a/hw/xquartz/X11Application.m
+++ b/hw/xquartz/X11Application.m
@@ -69,6 +69,7 @@ static dispatch_queue_t eventTranslationQueue;
 #endif
 
 extern Bool noTestExtensions;
+extern Bool noRenderExtension;
 
 #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
 static TISInputSourceRef last_key_layout;
@@ -889,6 +890,9 @@ darwinDesiredDepth];
 noTestExtensions = ![self prefs_get_boolean: @PREFS_TEST_EXTENSIONS default:
 FALSE];
 
+noRenderExtension = ![self prefs_get_boolean: @PREFS_RENDER_EXTENSION default:
+TRUE];
+
 XQuartzScrollInDeviceDirection =[self prefs_get_boolean: @PREFS_SCROLL_IN_DEV_DIRECTION default:
 XQuartzScrollInDeviceDirection];