diff --git a/tests/cases/compiler/commonSourceDir3.ts b/tests/cases/compiler/commonSourceDir3.ts
index cc42eb8f267..54b6e8c89b7 100644
--- a/tests/cases/compiler/commonSourceDir3.ts
+++ b/tests/cases/compiler/commonSourceDir3.ts
@@ -1,3 +1,4 @@
+// @useCaseSensitiveFileNames: false
 // @outDir: A:/
 // @Filename: A:/foo/bar.ts
 var x: number;