diff --git a/packages/vite/src/node/ssr/ssrModuleLoader.ts b/packages/vite/src/node/ssr/ssrModuleLoader.ts
index b9e5c5d17d1fc3..6ec0cbf08c9fba 100644
--- a/packages/vite/src/node/ssr/ssrModuleLoader.ts
+++ b/packages/vite/src/node/ssr/ssrModuleLoader.ts
@@ -97,6 +97,8 @@ async function instantiateModule(
   const resolveOptions: InternalResolveOptions = {
     conditions: ['node'],
     dedupe,
+    // Prefer CommonJS modules.
+    extensions: ['.js', '.mjs', '.ts', '.jsx', '.tsx', '.json'],
     isBuild: true,
     isProduction,
     // Disable "module" condition.