diff --git a/compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/ClassDeserialization.kt b/compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/ClassDeserialization.kt
index 5c0b05b084b..478fba4b5ba 100644
--- a/compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/ClassDeserialization.kt
+++ b/compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/ClassDeserialization.kt
@@ -17,7 +17,6 @@ import org.jetbrains.kotlin.fir.declarations.impl.FirResolvedDeclarationStatusIm
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.resolve.providers.impl.FirCloneableSymbolProvider.Companion.CLONE
 import org.jetbrains.kotlin.fir.resolve.providers.impl.FirCloneableSymbolProvider.Companion.CLONEABLE_CLASS_ID
-import org.jetbrains.kotlin.fir.resolve.transformers.sealedInheritors
 import org.jetbrains.kotlin.fir.scopes.FirScopeProvider
 import org.jetbrains.kotlin.fir.symbols.CallableId
 import org.jetbrains.kotlin.fir.symbols.ConeTypeParameterLookupTag
diff --git a/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt b/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt
index 4fbd57e802a..010aed0fe88 100644
--- a/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt
+++ b/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt
@@ -29,7 +29,6 @@ import org.jetbrains.kotlin.fir.resolve.fullyExpandedType
 import org.jetbrains.kotlin.fir.resolve.inference.isSuspendFunctionType
 import org.jetbrains.kotlin.fir.resolve.inference.suspendFunctionTypeToFunctionTypeWithContinuation
 import org.jetbrains.kotlin.fir.resolve.toSymbol
-import org.jetbrains.kotlin.fir.resolve.transformers.sealedInheritors
 import org.jetbrains.kotlin.fir.serialization.constant.EnumValue
 import org.jetbrains.kotlin.fir.serialization.constant.IntValue
 import org.jetbrains.kotlin.fir.serialization.constant.StringValue
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsProcessor.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsProcessor.kt
index 98d86b67a48..2254c96a831 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsProcessor.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsProcessor.kt
@@ -95,7 +95,3 @@ class FirSealedClassInheritorsProcessor(
     }
 
 }
-
-object SealedClassInheritorsKey : FirDeclarationDataKey()
-
-var FirRegularClass.sealedInheritors: List<ClassId>? by FirDeclarationDataRegistry.data(SealedClassInheritorsKey)
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/SealedClassInheritors.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/SealedClassInheritors.kt
new file mode 100644
index 00000000000..e16a6ad3498
--- /dev/null
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/SealedClassInheritors.kt
@@ -0,0 +1,12 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.declarations
+
+import org.jetbrains.kotlin.name.ClassId
+
+object SealedClassInheritorsKey : FirDeclarationDataKey()
+
+var FirRegularClass.sealedInheritors: List<ClassId>? by FirDeclarationDataRegistry.data(SealedClassInheritorsKey)