diff --git a/drivers/video/aty/mach64_gx.c b/drivers/video/aty/mach64_gx.c
index 01fdff7..2045639 100644
--- a/drivers/video/aty/mach64_gx.c
+++ b/drivers/video/aty/mach64_gx.c
@@ -149,8 +149,7 @@
 	};
 	int i;
 
-	for (i = 0; i < sizeof(RGB514_clocks) / sizeof(*RGB514_clocks);
-	     i++)
+	for (i = 0; i < ARRAY_SIZE(RGB514_clocks); i++)
 		if (vclk_per <= RGB514_clocks[i].limit) {
 			pll->ibm514.m = RGB514_clocks[i].m;
 			pll->ibm514.n = RGB514_clocks[i].n;