diff --git a/include/linux/units.h b/include/linux/units.h
index 3457179f7116..62149b5082e1 100644
--- a/include/linux/units.h
+++ b/include/linux/units.h
@@ -20,9 +20,9 @@
 #define PICO	1000000000000ULL
 #define FEMTO	1000000000000000ULL
 
-#define MILLIWATT_PER_WATT	1000L
-#define MICROWATT_PER_MILLIWATT	1000L
-#define MICROWATT_PER_WATT	1000000L
+#define MILLIWATT_PER_WATT	1000UL
+#define MICROWATT_PER_MILLIWATT	1000UL
+#define MICROWATT_PER_WATT	1000000UL
 
 #define ABSOLUTE_ZERO_MILLICELSIUS -273150