diff --git a/src/northbridge/intel/i945/i945.h b/src/northbridge/intel/i945/i945.h
index 8212386..9be9379 100644
--- a/src/northbridge/intel/i945/i945.h
+++ b/src/northbridge/intel/i945/i945.h
@@ -87,6 +87,8 @@
 
 /* Device 0:2.0 PCI configuration space (Graphics Device) */
 
+#define GMADR		0x18
+#define GTTADR		0x1c
 #define BSM		0x5c
 #define GCFC		0xf0	/* Graphics Clock Frequency & Gating Control */