diff --git a/src/plugins/loader.test-fixtures.ts b/src/plugins/loader.test-fixtures.ts
index e692a244133..23edcda9e21 100644
--- a/src/plugins/loader.test-fixtures.ts
+++ b/src/plugins/loader.test-fixtures.ts
@@ -33,6 +33,7 @@ export function mkdirSafe(dir: string) {
 const fixtureRoot = mkdtempSafe(path.join(os.tmpdir(), "openclaw-plugin-"));
 let tempDirIndex = 0;
 const prevBundledDir = process.env.OPENCLAW_BUNDLED_PLUGINS_DIR;
+const prevDisableBundledPlugins = process.env.OPENCLAW_DISABLE_BUNDLED_PLUGINS;
 const prevPluginStageDir = process.env.OPENCLAW_PLUGIN_STAGE_DIR;
 
 export const EMPTY_PLUGIN_SCHEMA = {
@@ -105,7 +106,8 @@ export function writePlugin(params: {
 }
 
 export function useNoBundledPlugins() {
-  process.env.OPENCLAW_BUNDLED_PLUGINS_DIR = "/nonexistent/bundled/plugins";
+  process.env.OPENCLAW_DISABLE_BUNDLED_PLUGINS = "1";
+  delete process.env.OPENCLAW_BUNDLED_PLUGINS_DIR;
 }
 
 export function loadBundleFixture(params: {
@@ -148,6 +150,11 @@ export function resetPluginLoaderTestStateForTest() {
   } else {
     process.env.OPENCLAW_BUNDLED_PLUGINS_DIR = prevBundledDir;
   }
+  if (prevDisableBundledPlugins === undefined) {
+    delete process.env.OPENCLAW_DISABLE_BUNDLED_PLUGINS;
+  } else {
+    process.env.OPENCLAW_DISABLE_BUNDLED_PLUGINS = prevDisableBundledPlugins;
+  }
   if (prevPluginStageDir === undefined) {
     delete process.env.OPENCLAW_PLUGIN_STAGE_DIR;
   } else {
@@ -161,4 +168,9 @@ export function cleanupPluginLoaderFixturesForTest() {
   } catch {
     // ignore cleanup failures in tests
   }
+  if (prevDisableBundledPlugins === undefined) {
+    delete process.env.OPENCLAW_DISABLE_BUNDLED_PLUGINS;
+  } else {
+    process.env.OPENCLAW_DISABLE_BUNDLED_PLUGINS = prevDisableBundledPlugins;
+  }
 }