diff --git a/common/include/gr.h b/common/include/gr.h
index 5dc1204d8..0e638879d 100644
--- a/common/include/gr.h
+++ b/common/include/gr.h
@@ -144,7 +144,7 @@ typedef struct _grs_canvas {
 
 typedef struct _grs_screen {    // This is a video screen
 	grs_canvas  sc_canvas;  // Represents the entire screen
-	int     sc_mode;        // Video mode number
+	u_int32_t     sc_mode;        // Video mode number
 	short   sc_w, sc_h;     // Actual Width and Height
 	fix     sc_aspect;      //aspect ratio (w/h) for this screen
 } grs_screen;