diff --git a/southbridge/nvidia/mcp55/mcp55_smbus.h b/southbridge/nvidia/mcp55/mcp55_smbus.h
index ea2178b716..71cf614906 100644
--- a/southbridge/nvidia/mcp55/mcp55_smbus.h
+++ b/southbridge/nvidia/mcp55/mcp55_smbus.h
@@ -38,7 +38,7 @@
 static inline void smbus_delay(void)
 {
 	/* let's hope this is not optimized out */
-	(void) intb(0x80);
+	(void) inb(0x80);
 }
 
 static int smbus_wait_until_ready(u16 smbus_io_base)
@@ -74,7 +74,7 @@ static int smbus_wait_until_done(u16 smbus_io_base)
 	return -3;
 }
 
-static int do_smbus_recv_byte(u16 smbus_io_base, unsigned u8)
+static int do_smbus_recv_byte(u16 smbus_io_base, u8 device)
 {
 	u8 global_status_register;
 	u8 byte;
diff --git a/southbridge/nvidia/mcp55/stage1_smbus.c b/southbridge/nvidia/mcp55/stage1_smbus.c
index 6a496b702d..21bf464561 100644
--- a/southbridge/nvidia/mcp55/stage1_smbus.c
+++ b/southbridge/nvidia/mcp55/stage1_smbus.c
@@ -72,7 +72,7 @@ static u8 smbus_read_byte(u8 device, u8 address)
 	return do_smbus_read_byte(SMBUS0_IO_BASE, device, address);
 }
 
-static u8 smbus_write_byte(u8 device, u8 address, u8 char val)
+static u8 smbus_write_byte(u8 device, u8 address, u8 val)
 {
 	return do_smbus_write_byte(SMBUS0_IO_BASE, device, address, val);
 }
@@ -82,7 +82,7 @@ static u8 smbusx_recv_byte(u8 smb_index, u8 device)
 	return do_smbus_recv_byte(SMBUS0_IO_BASE + (smb_index<<8), device);
 }
 
-static u8 smbusx_send_byte(u8 smb_index, u8 device, u8 char val)
+static u8 smbusx_send_byte(u8 smb_index, u8 device, u8 val)
 {
 	return do_smbus_send_byte(SMBUS0_IO_BASE + (smb_index<<8), device, val);
 }
@@ -92,7 +92,7 @@ static u8 smbusx_read_byte(u8 smb_index, u8 device, u8 address)
 	return do_smbus_read_byte(SMBUS0_IO_BASE + (smb_index<<8), device, address);
 }
 
-static u8 smbusx_write_byte(u8 smb_index, u8 device, u8 address, u8 char val)
+static u8 smbusx_write_byte(u8 smb_index, u8 device, u8 address, u8 val)
 {
 	return do_smbus_write_byte(SMBUS0_IO_BASE + (smb_index<<8), device, address, val);
 }