diff --git a/compiler/resolution.common/src/org/jetbrains/kotlin/resolve/calls/inference/model/NewConstraintSystemImpl.kt b/compiler/resolution.common/src/org/jetbrains/kotlin/resolve/calls/inference/model/NewConstraintSystemImpl.kt
index a27f9c56136..9c2189b17d5 100644
--- a/compiler/resolution.common/src/org/jetbrains/kotlin/resolve/calls/inference/model/NewConstraintSystemImpl.kt
+++ b/compiler/resolution.common/src/org/jetbrains/kotlin/resolve/calls/inference/model/NewConstraintSystemImpl.kt
@@ -774,6 +774,7 @@ class NewConstraintSystemImpl(
         return storage
     }
 
+    @K2Only
     val usesOuterCs: Boolean get() = storage.usesOuterCs
 
     // PostponedArgumentsAnalyzer.Context