diff --git a/packages/SwingSet/test/workers/test-snapstore.js b/packages/SwingSet/test/workers/test-snapstore.js
index dc64e3023e9a..855083e1ba9a 100644
--- a/packages/SwingSet/test/workers/test-snapstore.js
+++ b/packages/SwingSet/test/workers/test-snapstore.js
@@ -102,7 +102,10 @@ test('bootstrap, save, compress', async t => {
   );
 
   const zfile = path.resolve(pool, `${h}.gz`);
-  t.is(Kb(zfile), snapSize.compressed, 'compressed snapshots are smaller');
+  t.truthy(
+    Kb(zfile) <= snapSize.compressed,
+    'compressed snapshots are smaller',
+  );
 });
 
 test('create, save, restore, resume', async t => {