diff --git a/src/cpu/amd/car/cache_as_ram.inc b/src/cpu/amd/car/cache_as_ram.inc
index 8f0abce1a5..dd02f6c734 100644
--- a/src/cpu/amd/car/cache_as_ram.inc
+++ b/src/cpu/amd/car/cache_as_ram.inc
@@ -160,7 +160,7 @@ CAR_FAM10_out:
    #else
 	#error "bad MMCONF_BUS_NUMBER value"
    #endif
-	movl	$(0xc0010058), %ecx
+	movl	$MSR_MCFG_BASE, %ecx
 	wrmsr
 #endif