diff --git a/src/util.test.ts b/src/util.test.ts
index be08a9489..da293d696 100644
--- a/src/util.test.ts
+++ b/src/util.test.ts
@@ -538,9 +538,7 @@ test("getCgroupCpuCountFromCpus returns undefined if the CPU file exists but is
 test("checkDiskUsage succeeds and produces positive numbers", async (t) => {
   process.env["GITHUB_WORKSPACE"] = os.tmpdir();
   const diskUsage = await util.checkDiskUsage(getRunnerLogger(true));
-  t.true(
-    diskUsage?.numAvailableBytes !== undefined &&
-      diskUsage.numAvailableBytes > 0,
-  );
-  t.true(diskUsage?.numTotalBytes !== undefined && diskUsage.numTotalBytes > 0);
+  t.true(diskUsage !== undefined);
+  t.true(diskUsage!.numAvailableBytes > 0);
+  t.true(diskUsage!.numTotalBytes > 0);
 });