diff --git a/hw/xfree86/common/xf86RandR.c b/hw/xfree86/common/xf86RandR.c
index 79d301763..2d1ec5d85 100644
--- a/hw/xfree86/common/xf86RandR.c
+++ b/hw/xfree86/common/xf86RandR.c
@@ -74,7 +74,7 @@ xf86RandRGetInfo (ScreenPtr pScreen, Rotation *rotations)
 
     *rotations = RR_Rotate_0;
 
-    for (mode = scrp->modes; ; mode = mode->next)
+    for (mode = scrp->modes; mode != NULL ; mode = mode->next)
     {
 	int refresh = xf86RandRModeRefresh (mode);