diff --git a/code/modules/client/client_procs.dm b/code/modules/client/client_procs.dm
index e455db34fd1..8b95620d9d8 100644
--- a/code/modules/client/client_procs.dm
+++ b/code/modules/client/client_procs.dm
@@ -877,7 +877,7 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 #if (PRELOAD_RSC == 0)
 	var/static/next_external_rsc = 0
 	var/list/external_rsc_urls = CONFIG_GET(keyed_list/external_rsc_urls)
-	if(length(external_rsc_urls.len))
+	if(length(external_rsc_urls))
 		next_external_rsc = WRAP(next_external_rsc+1, 1, external_rsc_urls.len+1)
 		preload_rsc = external_rsc_urls[next_external_rsc]
 #endif