diff --git a/packages/vitest/src/node/plugins/index.ts b/packages/vitest/src/node/plugins/index.ts
index fb82f7884b3e..fa2d50e7f3df 100644
--- a/packages/vitest/src/node/plugins/index.ts
+++ b/packages/vitest/src/node/plugins/index.ts
@@ -98,6 +98,7 @@ export async function VitestPlugin(
             ...testConfig.api,
             open,
             hmr: false,
+            ws: testConfig.api?.middlewareMode ? false : undefined,
             preTransformRequests: false,
             fs: {
               allow: resolveFsAllow(getRoot(), testConfig.config),
diff --git a/packages/vitest/src/node/plugins/workspace.ts b/packages/vitest/src/node/plugins/workspace.ts
index 1c5ff4878835..6e4af78efddc 100644
--- a/packages/vitest/src/node/plugins/workspace.ts
+++ b/packages/vitest/src/node/plugins/workspace.ts
@@ -85,6 +85,7 @@ export function WorkspaceVitestPlugin(
             watch: null,
             open: false,
             hmr: false,
+            ws: false,
             preTransformRequests: false,
             middlewareMode: true,
             fs: {