diff --git a/tests/default.nix b/tests/default.nix
index b133aec..bb95d52 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -8,9 +8,7 @@
   # ingest = pkgs.callPackage ./ingest.nix { };
   multi-cache = pkgs.callPackage ./multi-cache.nix { };
   substitution = pkgs.callPackage ./substitution.nix { };
-  upstream-cache = {
-    tvix = pkgs.callPackage ./upstream-cache-tvix.nix { };
-    http-directory = pkgs.callPackage ./upstream-cache-http-directory.nix { };
-    nix-serve = pkgs.callPackage ./upstream-cache-nix-serve.nix { };
-  };
+  upstream-cache-tvix = pkgs.callPackage ./upstream-cache-tvix.nix { };
+  upstream-cache-http-directory = pkgs.callPackage ./upstream-cache-http-directory.nix { };
+  upstream-cache-nix-serve = pkgs.callPackage ./upstream-cache-nix-serve.nix { };
 }
diff --git a/tests/upstream-cache-http-directory.nix b/tests/upstream-cache-http-directory.nix
index 0b72719..7b997f7 100644
--- a/tests/upstream-cache-http-directory.nix
+++ b/tests/upstream-cache-http-directory.nix
@@ -69,9 +69,9 @@ pkgs.testers.runNixOSTest (_: {
         cache.succeed("nix store sign -k ${./cache-keys/privkey} ${hello}")
         cache.succeed("nix copy --to file:///srv ${hello}")
         narHash = "${hello}"[11:11+32]
-        out = cache.succeed(f"curl -f 'http://127.0.0.1/upstream/{narHash}.narinfo'")
+        out = cache.succeed(f"curl -f 'http://localhost/upstream/{narHash}.narinfo'")
         print(out)
-        cache.succeed(f"curl -f 'http://127.0.0.1/cache/{narHash}.narinfo'")
+        cache.succeed(f"curl -f 'http://localhost/cache/{narHash}.narinfo'")
     with subtest("Try to substitute from cache"):
         delete_and_substitute()
     with subtest("Check effective caching"):
diff --git a/tests/upstream-cache-tvix.nix b/tests/upstream-cache-tvix.nix
index 6988b46..284c88c 100644
--- a/tests/upstream-cache-tvix.nix
+++ b/tests/upstream-cache-tvix.nix
@@ -66,10 +66,10 @@ pkgs.testers.runNixOSTest (_: {
 
     with subtest("Upload"):
         cache.succeed("nix store sign -k ${./cache-keys/privkey} ${hello}")
-        cache.succeed("nix copy --to 'http://127.0.0.1/upstream/?compression=none' ${hello}")
+        cache.succeed("nix copy --to 'http://localhost/upstream/?compression=none' ${hello}")
         narHash = "${hello}"[11:11+32]
-        cache.succeed(f"curl -f 'http://127.0.0.1/upstream/{narHash}.narinfo'")
-        cache.succeed(f"curl -f 'http://127.0.0.1/cache/{narHash}.narinfo'")
+        cache.succeed(f"curl -f 'http://localhost/upstream/{narHash}.narinfo'")
+        cache.succeed(f"curl -f 'http://localhost/cache/{narHash}.narinfo'")
     with subtest("Try to substitute from cache"):
         delete_and_substitute()
     with subtest("Check effective caching"):