diff --git a/packages/knip/src/plugins/vitest/index.ts b/packages/knip/src/plugins/vitest/index.ts
index 261046836..d93fdfb80 100644
--- a/packages/knip/src/plugins/vitest/index.ts
+++ b/packages/knip/src/plugins/vitest/index.ts
@@ -14,7 +14,7 @@ const enablers = ['vitest'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = ['vitest*.config.{js,mjs,ts,cjs,mts,cts}', 'vitest.{workspace,projects}.{ts,js,json}'];
+const config = ['vitest*.config.{js,mjs,ts,cjs,mts,cts}', 'vitest.{workspace,projects}.{js,mjs,ts,cjs,mts,cts,json}'];
 
 const entry = ['**/*.{bench,test,test-d,spec}.?(c|m)[jt]s?(x)'];