diff --git a/pkgs/development/lua-modules/overrides.nix b/pkgs/development/lua-modules/overrides.nix
index 51b8a30584d4..dd8e975d32c7 100644
--- a/pkgs/development/lua-modules/overrides.nix
+++ b/pkgs/development/lua-modules/overrides.nix
@@ -246,7 +246,7 @@ in
     if luaAtLeast "5.1" && luaOlder "5.2" then {
       version = "20120430.51-1";
       knownRockspec = (fetchurl {
-        url = "https://luarocks.org/lmathx-20120430.51-1.rockspec";
+        url = "mirror://luarocks/lmathx-20120430.51-1.rockspec";
         sha256 = "148vbv2g3z5si2db7rqg5bdily7m4sjyh9w6r3jnx3csvfaxyhp0";
       }).outPath;
       src = fetchurl {
@@ -257,7 +257,7 @@ in
       if luaAtLeast "5.2" && luaOlder "5.3" then {
         version = "20120430.52-1";
         knownRockspec = (fetchurl {
-          url = "https://luarocks.org/lmathx-20120430.52-1.rockspec";
+          url = "mirror://luarocks/lmathx-20120430.52-1.rockspec";
           sha256 = "14rd625sipakm72wg6xqsbbglaxyjba9nsajsfyvhg0sz8qjgdya";
         }).outPath;
         src = fetchurl {