diff --git a/idea/testData/checker/regression/Jet53.kt b/idea/testData/checker/regression/Jet53.kt
index e7a7f0c8db9..985de058084 100644
--- a/idea/testData/checker/regression/Jet53.kt
+++ b/idea/testData/checker/regression/Jet53.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 import java.util.Collections
 
 fun <T> checkSubtype(t: T) = t