diff --git a/evutil_rand.c b/evutil_rand.c
index 3c2c81de..4df685ca 100644
--- a/evutil_rand.c
+++ b/evutil_rand.c
@@ -76,8 +76,11 @@ ev_arc4random_buf(void *buf, size_t n)
 	 * and fall back otherwise.  (OSX does this using some linker
 	 * trickery.)
 	 */
-	if (arc4random_buf != NULL) {
-		return arc4random_buf(buf, n);
+	{
+		void (*tptr)() = (void*)arc4random_buf;
+		if (tptr != NULL) {
+			return arc4random_buf(buf, n);
+		}
 	}
 #endif
 	/* Make sure that we start out with b at a 4-byte alignment; plenty