diff --git a/__tests__/applyAtRule.test.js b/__tests__/applyAtRule.test.js
index 7168c4666..14903b452 100644
--- a/__tests__/applyAtRule.test.js
+++ b/__tests__/applyAtRule.test.js
@@ -206,7 +206,7 @@ test('you can apply utility classes without using the given prefix', () => {
     ...defaultConfig,
     options: {
       ...defaultConfig.options,
-      prefix: 'prefix',
+      prefix: 'prefix-',
     },
   }