diff --git a/MVMCoreUI/Models/Extensions/ModelHelper.swift b/MVMCoreUI/Models/Extensions/ModelHelper.swift
index 1f15274f..c56a0a5a 100644
--- a/MVMCoreUI/Models/Extensions/ModelHelper.swift
+++ b/MVMCoreUI/Models/Extensions/ModelHelper.swift
@@ -11,12 +11,15 @@ import Foundation
 
 
 extension KeyedDecodingContainer where Key : CodingKey{
+    private enum TypeCodingKey: String, CodingKey {
+        case moleculeName
+    }
     
     public func decode(codingKey: KeyedDecodingContainer<K>.Key) throws -> MoleculeProtocol {
-        return try decode(codingKey: codingKey, typeCodingKey: .moleculeName)
+        return try decode(codingKey: codingKey, typeCodingKey: TypeCodingKey.moleculeName)
     }
     
     public func decodeIfPresent(codingKey: KeyedDecodingContainer<K>.Key) throws -> MoleculeProtocol? {
-        return try decodeIfPresent(codingKey: codingKey, typeCodingKey: .moleculeName)
+        return try decodeIfPresent(codingKey: codingKey, typeCodingKey: TypeCodingKey.moleculeName)
     }
 }