diff --git a/src/tool_urlglob.c b/src/tool_urlglob.c
index 29c4119cd7..c20bbd4ea3 100644
--- a/src/tool_urlglob.c
+++ b/src/tool_urlglob.c
@@ -68,8 +68,9 @@ static int multiply(curl_off_t *amount, curl_off_t with)
     sum = 0;
   }
   else {
-#if defined(__GNUC__) && \
-  ((__GNUC__ > 5) || ((__GNUC__ == 5) && (__GNUC_MINOR__ >= 1)))
+#if (defined(__GNUC__) && \
+  ((__GNUC__ > 5) || ((__GNUC__ == 5) && (__GNUC_MINOR__ >= 1)))) || \
+  (defined(__clang__) && __clang_major__ >= 8)
     if(__builtin_mul_overflow(*amount, with, &sum))
       return 1;
 #else