diff --git a/spec/fixtures/packages/theme-with-ui-variables/package.json b/spec/fixtures/packages/theme-with-ui-variables/package.json
index 047ee57c9..b62d9ab61 100644
--- a/spec/fixtures/packages/theme-with-ui-variables/package.json
+++ b/spec/fixtures/packages/theme-with-ui-variables/package.json
@@ -1,4 +1,4 @@
 {
   "theme": "ui",
-  "stylesheets": ["editor.less"]
+  "styleSheets": ["editor.less"]
 }