diff --git a/src/frame.h b/src/frame.h
index 4933b4d649b..4c29c839897 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -265,7 +265,11 @@ typedef struct frame *FRAME_PTR;
 #define FRAME_NEW_HEIGHT(f) (f)->new_height
 #define FRAME_NEW_WIDTH(f) (f)->new_width
 #define FRAME_MENU_BAR_LINES(f) (f)->menu_bar_lines
+#ifdef USE_X_TOOLKIT
 #define FRAME_EXTERNAL_MENU_BAR(f) (f)->external_menu_bar
+#else
+#define FRAME_EXTERNAL_MENU_BAR(f) 0
+#endif
 #define FRAME_CURSOR_X(f) (f)->cursor_x
 #define FRAME_CURSOR_Y(f) (f)->cursor_y
 #define FRAME_VISIBLE_P(f) ((f)->visible != 0)