diff --git a/vitest.config.ts b/vitest.config.ts
index ede31fee..ead1997f 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -15,6 +15,9 @@ export default defineConfig({
   resolve: {
     alias: {
       "@": path.resolve(__dirname, "./src"),
+      // `server-only` is a marker package with no Node-resolvable entry under
+      // Vite; stub it so tests that import a server module chain still load.
+      "server-only": path.resolve(__dirname, "./vitest/server-only-stub.ts"),
     },
   },
 });
diff --git a/vitest/server-only-stub.ts b/vitest/server-only-stub.ts
new file mode 100644
index 00000000..636d6ece
--- /dev/null
+++ b/vitest/server-only-stub.ts
@@ -0,0 +1,6 @@
+// Empty stub for the `server-only` marker package under Vitest. The real
+// package resolves to an empty module on the server and a throwing one in the
+// browser via export conditions Vite doesn't apply here; aliasing it keeps
+// server-only guards in place in app code without breaking Node-env tests that
+// import a module chain containing one. See vitest.config.ts.
+export {};