diff --git a/include/linux/damon.h b/include/linux/damon.h
index 3e91a597a1aadb4fefe4dbc4a8e327f7e7e7bb83..e2c8152985b7dcadb49e7638deceacf749524473 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -19,7 +19,10 @@
 #define DAMOS_MAX_SCORE		(99)
 
 /* Get a random number in [l, r) */
-#define damon_rand(l, r) (l + prandom_u32_max(r - l))
+static inline unsigned long damon_rand(unsigned long l, unsigned long r)
+{
+	return l + prandom_u32_max(r - l);
+}
 
 /**
  * struct damon_addr_range - Represents an address region of [@start, @end).