diff --git a/.github/workflows/compat53-tests.yml b/.github/workflows/compat53-tests.yml
index 02a9674..34a4f78 100644
--- a/.github/workflows/compat53-tests.yml
+++ b/.github/workflows/compat53-tests.yml
@@ -21,7 +21,7 @@ jobs:
             external: true
           - luaVersion: "lua=5.1"
             compiler: clang
-            external: true
+            external: false
           - luaVersion: "luajit=@v2.1 --compat=none"
             compiler: gcc
             external: false