diff --git a/icx3.h b/icx3.h
index 2931e38..715db61 100644
--- a/icx3.h
+++ b/icx3.h
@@ -1,6 +1,7 @@
 #ifndef ICX3_H
 #define ICX3_H
 
+#include <stdint.h>
 #include "evga-card.h"
 
 #define ICX3_I2C_ADDR 0x2D
@@ -22,26 +23,26 @@
 #define ICX3_WRITE_DISABLED 0xFE
 
 struct icx3_fan_control {
-	unsigned char length;
-	unsigned char fanmode;
-	unsigned short rpm_offset;
-	unsigned char duty;
-	unsigned char duty_status;
-	unsigned short rpm_status;
+	uint8_t length;
+	uint8_t fanmode;
+	uint16_t rpm_offset;
+	uint8_t duty;
+	uint8_t duty_status;
+	uint16_t rpm_status;
 };
 
 struct icx3_temp_sensors {
-	unsigned char length;
-	unsigned char data[18];
+	uint8_t length;
+	uint8_t data[18];
 };
 
 struct icx3_info {
-	unsigned char length;
-	unsigned char reserved;
-	unsigned char slave_address;
-	unsigned char product_id;
-	unsigned char major_version;
-	unsigned char minor_version;
+	uint8_t length;
+	uint8_t reserved;
+	uint8_t slave_address;
+	uint8_t product_id;
+	uint8_t major_version;
+	uint8_t minor_version;
 };
 
 enum icx3_product_id {