diff --git a/include/linux/units.h b/include/linux/units.h
index 92c234e71cab..4a23e39acc7b 100644
--- a/include/linux/units.h
+++ b/include/linux/units.h
@@ -4,9 +4,9 @@
 
 #include <linux/kernel.h>
 
-#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