diff --git a/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/types/LazyJavaTypeResolver.kt b/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/types/LazyJavaTypeResolver.kt
index e9a196d11a0..03402fc4392 100644
--- a/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/types/LazyJavaTypeResolver.kt
+++ b/core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/types/LazyJavaTypeResolver.kt
@@ -259,14 +259,6 @@ class LazyJavaTypeResolver(
             }
         }
 
-        override fun computeMemberScope(): JetScope {
-            val descriptor = getConstructor().getDeclarationDescriptor()!!
-
-            if (descriptor is TypeParameterDescriptor) return descriptor.getDefaultType().getMemberScope()
-
-             return (descriptor as ClassDescriptor).getMemberScope(substitution)
-        }
-
         override fun computeCustomSubstitution() = if (isRaw()) RawSubstitution else null
 
         private object RawSubstitution : TypeSubstitution() {
diff --git a/core/descriptors/src/org/jetbrains/kotlin/types/AbstractLazyType.kt b/core/descriptors/src/org/jetbrains/kotlin/types/AbstractLazyType.kt
index 960ab47a12d..1b405bff619 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/types/AbstractLazyType.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/types/AbstractLazyType.kt
@@ -39,7 +39,14 @@ public abstract class AbstractLazyType(storageManager: StorageManager) : Abstrac
     private val memberScope = storageManager.createLazyValue { computeMemberScope() }
     override fun getMemberScope() = memberScope()
 
-    protected abstract fun computeMemberScope(): JetScope
+    protected open fun computeMemberScope(): JetScope {
+        val descriptor = constructor.getDeclarationDescriptor()
+        return when (descriptor) {
+            is TypeParameterDescriptor -> descriptor.getDefaultType().getMemberScope()
+            is ClassDescriptor -> descriptor.getMemberScope(substitution)
+            else -> throw IllegalStateException("Unsupported classifier: $descriptor")
+        }
+    }
 
     override fun isMarkedNullable() = false
 
diff --git a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/DeserializedType.kt b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/DeserializedType.kt
index e0665d3c949..24fba0e3ee5 100644
--- a/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/DeserializedType.kt
+++ b/core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/DeserializedType.kt
@@ -16,14 +16,12 @@
 
 package org.jetbrains.kotlin.serialization.deserialization
 
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
-import org.jetbrains.kotlin.resolve.DescriptorUtils
-import org.jetbrains.kotlin.resolve.scopes.JetScope
 import org.jetbrains.kotlin.serialization.ProtoBuf
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedAnnotations
-import org.jetbrains.kotlin.types.*
+import org.jetbrains.kotlin.types.AbstractLazyType
+import org.jetbrains.kotlin.types.ErrorUtils
+import org.jetbrains.kotlin.types.LazyType
 import org.jetbrains.kotlin.utils.toReadOnlyList
 
 class DeserializedType(
@@ -40,29 +38,12 @@ class DeserializedType(
             typeDeserializer.typeArgument(getConstructor().getParameters().getOrNull(index), proto)
         }.toReadOnlyList()
 
-    override fun computeMemberScope() =
-        if (isError()) {
-            ErrorUtils.createErrorScope(getConstructor().toString())
-        }
-        else {
-            getTypeMemberScope(getConstructor(), getArguments())
-        }
-
     private val annotations = DeserializedAnnotations(c.storageManager) {
         c.components.annotationAndConstantLoader.loadTypeAnnotations(typeProto, c.nameResolver)
     }
 
     override fun isMarkedNullable(): Boolean = typeProto.getNullable()
 
-    private fun getTypeMemberScope(constructor: TypeConstructor, typeArguments: List<TypeProjection>): JetScope {
-        val descriptor = constructor.getDeclarationDescriptor()
-        return when (descriptor) {
-            is TypeParameterDescriptor -> descriptor.getDefaultType().getMemberScope()
-            is ClassDescriptor -> descriptor.getMemberScope(typeArguments)
-            else -> throw IllegalStateException("Unsupported classifier: $descriptor")
-        }
-    }
-
     override fun isError(): Boolean {
         val descriptor = getConstructor().getDeclarationDescriptor()
         return descriptor != null && ErrorUtils.isError(descriptor)