diff --git a/extensions/browser/src/plugin-service.test.ts b/extensions/browser/src/plugin-service.test.ts
index e8e4c7aec5b..8023fa56eba 100644
--- a/extensions/browser/src/plugin-service.test.ts
+++ b/extensions/browser/src/plugin-service.test.ts
@@ -30,7 +30,11 @@ describe("createBrowserPluginService", () => {
   });
 
   function getStartParams(): StartLazyPluginServiceModuleParamsWithValidator {
-    const params = runtimeMocks.startLazyPluginServiceModule.mock.calls[0]?.[0];
+    const [call] = runtimeMocks.startLazyPluginServiceModule.mock.calls;
+    if (!call) {
+      throw new Error("expected browser plugin service lazy loader call");
+    }
+    const [params] = call;
     if (!params?.validateOverrideSpecifier) {
       throw new Error("expected browser plugin service to pass validateOverrideSpecifier");
     }