diff --git a/test/fixtures/expected/gamma-0.0.jpg b/test/fixtures/expected/gamma-0.0.jpg
index 01dba1c1..30c123c6 100644
Binary files a/test/fixtures/expected/gamma-0.0.jpg and b/test/fixtures/expected/gamma-0.0.jpg differ
diff --git a/test/unit/gamma.js b/test/unit/gamma.js
index 1c29cc6a..2779ad6e 100644
--- a/test/unit/gamma.js
+++ b/test/unit/gamma.js
@@ -14,7 +14,7 @@ describe('Gamma correction', function() {
         assert.strictEqual('jpeg', info.format);
         assert.strictEqual(129, info.width);
         assert.strictEqual(111, info.height);
-        fixtures.assertSimilar(fixtures.expected('gamma-0.0.jpg'), data, done);
+        fixtures.assertSimilar(fixtures.expected('gamma-0.0.jpg'), data, { threshold: 9 }, done);
       });
   });