diff --git a/src/northbridge/intel/i440bx/ram_calc.c b/src/northbridge/intel/i440bx/ram_calc.c
index 962f3ba..3207688 100644
--- a/src/northbridge/intel/i440bx/ram_calc.c
+++ b/src/northbridge/intel/i440bx/ram_calc.c
@@ -16,6 +16,7 @@
 #define __SIMPLE_DEVICE__
 
 #include <arch/io.h>
+#include <device/pci_ops.h>
 #include <cbmem.h>
 #include <console/console.h>
 #include <commonlib/helpers.h>