diff --git a/extensions/qa-matrix/src/shared/live-transport-cli.runtime.test.ts b/extensions/qa-matrix/src/shared/live-transport-cli.runtime.test.ts
index 71836c696b6..dab18507bff 100644
--- a/extensions/qa-matrix/src/shared/live-transport-cli.runtime.test.ts
+++ b/extensions/qa-matrix/src/shared/live-transport-cli.runtime.test.ts
@@ -56,7 +56,14 @@ describe("live transport CLI runtime", () => {
         outputDir,
       });
       process.stdout.write("stdout marker\n");
-      await expect(tee.stop()).rejects.toMatchObject({ code: "EISDIR" });
+      let stopError: unknown;
+      try {
+        await tee.stop();
+      } catch (caught) {
+        stopError = caught;
+      }
+      expect(stopError).toBeInstanceOf(Error);
+      expect((stopError as NodeJS.ErrnoException).code).toBe("EISDIR");
 
       expect(process.stdout.write).toBe(mutedStdoutWrite);
       expect(process.stderr.write).toBe(mutedStderrWrite);