diff --git a/lib/sensors.h b/lib/sensors.h
index 96332a4a..2a4669ea 100644
--- a/lib/sensors.h
+++ b/lib/sensors.h
@@ -30,7 +30,7 @@
    when the API + ABI breaks), the third digit is incremented to track small
    API additions like new flags / enum values. The second digit is for tracking
    larger additions like new methods. */
-#define SENSORS_API_VERSION 400
+#define SENSORS_API_VERSION 0x400
 
 #define SENSORS_CHIP_NAME_PREFIX_ANY NULL
 #define SENSORS_CHIP_NAME_ADDR_ANY -1