diff --git a/src/northbridge/intel/gm45/gm45.h b/src/northbridge/intel/gm45/gm45.h
index d93b6e4..673160b 100644
--- a/src/northbridge/intel/gm45/gm45.h
+++ b/src/northbridge/intel/gm45/gm45.h
@@ -429,6 +429,9 @@
 u32 decode_igd_gtt_size(u32 gsm);
 
 void init_iommu(void);
+
+struct acpi_rsdp;
+unsigned long northbridge_write_acpi_tables(unsigned long start, struct acpi_rsdp *rsdp);
 #endif
 
 #endif