diff --git a/packages/mcp-gateway/package.nix b/packages/mcp-gateway/package.nix
index 5751273..5b346ee 100644
--- a/packages/mcp-gateway/package.nix
+++ b/packages/mcp-gateway/package.nix
@@ -28,7 +28,8 @@ rustPlatform.buildRustPackage rec {
   doCheck = false;
 
   postInstall = ''
-    install -Dm644 /dev/stdout $out/lib/systemd/user/mcp-gateway.service <<EOF
+    mkdir -p $out/lib/systemd/user
+    cat > $out/lib/systemd/user/mcp-gateway.service << 'EOF'
 [Unit]
 Description=MCP Gateway
 After=network-online.target