diff --git a/tests/ci-workflows.test.ts b/tests/ci-workflows.test.ts
index c5b635d65..e97b53d92 100644
--- a/tests/ci-workflows.test.ts
+++ b/tests/ci-workflows.test.ts
@@ -163,7 +163,8 @@ describe("GitHub Actions hardening", () => {
     // the runner's disk and the suite passes against a tree that no longer
     // exists in git.
     const winSteps = (ci.jobs?.["platform-windows"] as { steps?: { if?: string; run?: string }[] })?.steps ?? [];
-    expect(winSteps.some(step => step.run?.includes(`--shard=\${{ matrix.shard }}/${windowsShards.length}`))).toBe(true);
+    expect(winSteps.some(step => step.run?.includes("bun test --isolate tests")
+      && step.run.includes(`--shard=\${{ matrix.shard }}/${windowsShards.length}`))).toBe(true);
     expect(winSteps.some(step => step.if === "runner.environment == 'self-hosted'"
       && step.run?.includes("git clean -xffd"))).toBe(true);