diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/serialization/JvmSerializerExtension.java b/compiler/backend/src/org/jetbrains/kotlin/codegen/serialization/JvmSerializerExtension.java
index 61f3af7139b..37d24682a40 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/serialization/JvmSerializerExtension.java
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/serialization/JvmSerializerExtension.java
@@ -29,11 +29,11 @@ import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor;
 import org.jetbrains.kotlin.descriptors.impl.LocalVariableDescriptor;
 import org.jetbrains.kotlin.load.java.JvmAbi;
 import org.jetbrains.kotlin.load.java.lazy.types.RawTypeImpl;
-import org.jetbrains.kotlin.load.kotlin.JavaFlexibleTypeDeserializer;
 import org.jetbrains.kotlin.load.kotlin.TypeSignatureMappingKt;
 import org.jetbrains.kotlin.metadata.ProtoBuf;
 import org.jetbrains.kotlin.metadata.jvm.JvmProtoBuf;
 import org.jetbrains.kotlin.metadata.jvm.deserialization.ClassMapperLite;
+import org.jetbrains.kotlin.metadata.jvm.deserialization.JvmProtoBufUtil;
 import org.jetbrains.kotlin.name.ClassId;
 import org.jetbrains.kotlin.name.FqName;
 import org.jetbrains.kotlin.protobuf.GeneratedMessageLite;
@@ -132,7 +132,7 @@ public class JvmSerializerExtension extends SerializerExtension {
             @NotNull ProtoBuf.Type.Builder lowerProto,
             @NotNull ProtoBuf.Type.Builder upperProto
     ) {
-        lowerProto.setFlexibleTypeCapabilitiesId(getStringTable().getStringIndex(JavaFlexibleTypeDeserializer.INSTANCE.getId()));
+        lowerProto.setFlexibleTypeCapabilitiesId(getStringTable().getStringIndex(JvmProtoBufUtil.PLATFORM_TYPE_ID));
 
         if (flexibleType instanceof RawTypeImpl) {
             lowerProto.setExtension(JvmProtoBuf.isRaw, true);
diff --git a/core/descriptors.jvm/src/org/jetbrains/kotlin/load/kotlin/JavaFlexibleTypeDeserializer.kt b/core/descriptors.jvm/src/org/jetbrains/kotlin/load/kotlin/JavaFlexibleTypeDeserializer.kt
index 57ceb3695b7..e269842a5db 100644
--- a/core/descriptors.jvm/src/org/jetbrains/kotlin/load/kotlin/JavaFlexibleTypeDeserializer.kt
+++ b/core/descriptors.jvm/src/org/jetbrains/kotlin/load/kotlin/JavaFlexibleTypeDeserializer.kt
@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.load.kotlin
 import org.jetbrains.kotlin.load.java.lazy.types.RawTypeImpl
 import org.jetbrains.kotlin.metadata.ProtoBuf
 import org.jetbrains.kotlin.metadata.jvm.JvmProtoBuf
+import org.jetbrains.kotlin.metadata.jvm.deserialization.JvmProtoBufUtil
 import org.jetbrains.kotlin.serialization.deserialization.FlexibleTypeDeserializer
 import org.jetbrains.kotlin.types.ErrorUtils
 import org.jetbrains.kotlin.types.KotlinType
@@ -26,13 +27,13 @@ import org.jetbrains.kotlin.types.KotlinTypeFactory
 import org.jetbrains.kotlin.types.SimpleType
 
 object JavaFlexibleTypeDeserializer : FlexibleTypeDeserializer {
-    val id = "kotlin.jvm.PlatformType"
-
     override fun create(proto: ProtoBuf.Type, flexibleId: String, lowerBound: SimpleType, upperBound: SimpleType): KotlinType {
-        if (flexibleId != id) return ErrorUtils.createErrorType("Error java flexible type with id: $flexibleId. ($lowerBound..$upperBound)")
+        if (flexibleId != JvmProtoBufUtil.PLATFORM_TYPE_ID) {
+            return ErrorUtils.createErrorType("Error java flexible type with id: $flexibleId. ($lowerBound..$upperBound)")
+        }
         if (proto.hasExtension(JvmProtoBuf.isRaw)) {
             return RawTypeImpl(lowerBound, upperBound)
         }
         return KotlinTypeFactory.flexibleType(lowerBound, upperBound)
     }
-}
\ No newline at end of file
+}
diff --git a/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmProtoBufUtil.kt b/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmProtoBufUtil.kt
index 73894465a52..11824296862 100644
--- a/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmProtoBufUtil.kt
+++ b/core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/JvmProtoBufUtil.kt
@@ -15,6 +15,8 @@ import java.io.InputStream
 object JvmProtoBufUtil {
     val EXTENSION_REGISTRY: ExtensionRegistryLite = ExtensionRegistryLite.newInstance().apply(JvmProtoBuf::registerAllExtensions)
 
+    const val PLATFORM_TYPE_ID = "kotlin.jvm.PlatformType"
+
     @JvmStatic
     fun readClassDataFrom(data: Array<String>, strings: Array<String>): Pair<JvmNameResolver, ProtoBuf.Class> =
         readClassDataFrom(BitEncoding.decodeBytes(data), strings)