diff --git a/include/linux/dim.h b/include/linux/dim.h
index 9fa4b3f88c39..2571da63877c 100644
--- a/include/linux/dim.h
+++ b/include/linux/dim.h
@@ -17,7 +17,7 @@
  * We consider 10% difference as significant.
  */
 #define IS_SIGNIFICANT_DIFF(val, ref) \
-	(((100UL * abs((val) - (ref))) / (ref)) > 10)
+	((ref) && (((100UL * abs((val) - (ref))) / (ref)) > 10))
 
 /**
  * Calculate the gap between two values.