diff --git a/c/src/libchip/i2c/i2c-2b-eeprom.c b/c/src/libchip/i2c/i2c-2b-eeprom.c
index c24463f5d5..65e4d9fe3d 100644
--- a/c/src/libchip/i2c/i2c-2b-eeprom.c
+++ b/c/src/libchip/i2c/i2c-2b-eeprom.c
@@ -15,7 +15,7 @@
 #include <rtems/libio.h>
 
 #define EEPROM_PG_SZ	32
-#define ALGN(x)	(((unsigned32)(x) + EEPROM_PG_SZ) & ~(EEPROM_PG_SZ-1))
+#define ALGN(x)	(((uint32_t)(x) + EEPROM_PG_SZ) & ~(EEPROM_PG_SZ-1))
 
 static rtems_status_code
 send_file_ptr (rtems_device_minor_number minor, unsigned pos, int tout)
diff --git a/c/src/libchip/rtc/mc146818a.h b/c/src/libchip/rtc/mc146818a.h
index 481772e3bd..df4a234b78 100644
--- a/c/src/libchip/rtc/mc146818a.h
+++ b/c/src/libchip/rtc/mc146818a.h
@@ -57,12 +57,12 @@ boolean mc146818a_probe(
  */
 uint32_t mc146818a_get_register(
   uint32_t  ulCtrlPort,
-  unsigned8   ucRegNum
+  uint8_t   ucRegNum
 );
 
 void  mc146818a_set_register(
   uint32_t  ulCtrlPort,
-  unsigned8   ucRegNum,
+  uint8_t   ucRegNum,
   uint32_t  ucData
 );