diff --git a/http.c b/http.c
index b2ae8de16..a815f628b 100644
--- a/http.c
+++ b/http.c
@@ -651,14 +651,14 @@ void run_active_slot(struct active_request_slot *slot)
 		}
 
 		if (slot->in_use && !data_received) {
-			max_fd = 0;
+			max_fd = -1;
 			FD_ZERO(&readfds);
 			FD_ZERO(&writefds);
 			FD_ZERO(&excfds);
+			curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 			select_timeout.tv_sec = 0;
 			select_timeout.tv_usec = 50000;
-			select(max_fd, &readfds, &writefds,
-			       &excfds, &select_timeout);
+			select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 		}
 	}
 #else