diff --git a/tests/cases/compiler/lateBoundConstraintTypeChecksCorrectly.ts b/tests/cases/compiler/lateBoundConstraintTypeChecksCorrectly.ts
index 09aa9cfdd94..e756b4ef4e0 100644
--- a/tests/cases/compiler/lateBoundConstraintTypeChecksCorrectly.ts
+++ b/tests/cases/compiler/lateBoundConstraintTypeChecksCorrectly.ts
@@ -1,3 +1,5 @@
+// @keyofStringsOnly: true
+
 declare const fooProp: unique symbol;
 declare const barProp: unique symbol;