diff --git a/evutil_rand.c b/evutil_rand.c
index 9bdae14..6d2b1a1 100644
--- a/evutil_rand.c
+++ b/evutil_rand.c
@@ -193,8 +193,13 @@ evutil_secure_rng_get_bytes(void *buf, size_t n)
 void
 evutil_secure_rng_add_bytes(const char *buf, size_t n)
 {
+#ifdef EVENT__HAVE_ARC4RANDOM
+	(void)buf;
+	(void)n;
+#else
 	arc4random_addrandom((unsigned char*)buf,
 	    n>(size_t)INT_MAX ? INT_MAX : (int)n);
+#endif
 }
 
 void