diff --git a/southbridge/nvidia/mcp55/mcp55_smbus.h b/southbridge/nvidia/mcp55/mcp55_smbus.h
index fa83bb0f96..317214fded 100644
--- a/southbridge/nvidia/mcp55/mcp55_smbus.h
+++ b/southbridge/nvidia/mcp55/mcp55_smbus.h
@@ -23,6 +23,7 @@
 
 #include <device/smbus_def.h>
 #include <shared.h> /* We share symbols from stage 0 */
+#include <lib.h>
 
 
 #define SMBHSTSTAT	0x1