diff --git a/src/northbridge/intel/i945/Makefile.inc b/src/northbridge/intel/i945/Makefile.inc
index 5447e44..57362c6 100644
--- a/src/northbridge/intel/i945/Makefile.inc
+++ b/src/northbridge/intel/i945/Makefile.inc
@@ -17,6 +17,6 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 #
 
-driver-y += northbridge.o
-driver-y += gma.o
-obj-$(CONFIG_GENERATE_ACPI_TABLES) += acpi.o
+driver-y += northbridge.c
+driver-y += gma.c
+ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpi.c