diff --git a/src/northbridge/intel/i945/ram_calc.c b/src/northbridge/intel/i945/ram_calc.c
index 124a6a8..752c8f9 100644
--- a/src/northbridge/intel/i945/ram_calc.c
+++ b/src/northbridge/intel/i945/ram_calc.c
@@ -82,7 +82,7 @@
 	static const u16 ggc2uma[] = { 0, 1, 4, 8, 16, 32,
 			48, 64 };
 
-	if (gms > ARRAY_SIZE(ggc2uma))
+	if (gms >= ARRAY_SIZE(ggc2uma))
 		die("Bad Graphics Mode Select (GMS) setting.\n");
 
 	return ggc2uma[gms] << 10;