diff --git a/src/northbridge/intel/gm45/gma.c b/src/northbridge/intel/gm45/gma.c
index c771ea2..178149d 100644
--- a/src/northbridge/intel/gm45/gma.c
+++ b/src/northbridge/intel/gm45/gma.c
@@ -33,7 +33,7 @@
 {
 	const u16 cdclk_sel = pci_read_config16(dev, GCFGC_OFFSET) & GCFGC_CD_MASK;
 
-	switch (MCHBAR8(HPLLVCO_MCHBAR) & 0x7) {
+	switch (mchbar_read8(HPLLVCO_MCHBAR) & 0x7) {
 	case VCO_2666:
 	case VCO_4000:
 	case VCO_5333: