diff --git a/ChangeLog b/ChangeLog
index 77037dc12..19764ac32 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -18,6 +18,9 @@
 	* xfixes/xfixes.c:
 	Coverity #487: Check version number correctly.
 
+	* hw/xfree86/common/xf86VidMode.c:
+	Coverity #490: Fix a range check in xf86vidmode extension.
+
 2006-03-15  Benjamin Herrenschmidt  <benh@kernel.crashing.org>
 
 	* hw/xfree86/dri/dri.c: (DRIExtensionInit):
diff --git a/hw/xfree86/common/xf86VidMode.c b/hw/xfree86/common/xf86VidMode.c
index 81e4b969e..f91164384 100644
--- a/hw/xfree86/common/xf86VidMode.c
+++ b/hw/xfree86/common/xf86VidMode.c
@@ -183,7 +183,7 @@ VidModeGetDotClock(int scrnIndex, int Clock)
 	return 0;
 
     pScrn = xf86Screens[scrnIndex];
-    if ((pScrn->progClock) || (Clock > MAXCLOCKS))
+    if ((pScrn->progClock) || (Clock >= MAXCLOCKS))
 	return Clock;
     else  
 	return pScrn->clock[Clock];