diff --git a/src/Spring/Spring.Core/Objects/Factory/Config/ManagedDictionary.cs b/src/Spring/Spring.Core/Objects/Factory/Config/ManagedDictionary.cs
index ae46b4e0..ec70752e 100644
--- a/src/Spring/Spring.Core/Objects/Factory/Config/ManagedDictionary.cs
+++ b/src/Spring/Spring.Core/Objects/Factory/Config/ManagedDictionary.cs
@@ -1,7 +1,7 @@
 #region License
 
 /*
- * Copyright © 2002-2011 the original author or authors.
+ * Copyright � 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -213,12 +213,16 @@ namespace Spring.Objects.Factory.Config
             {
                 return this;
             }
-            IDictionary pDict = parent as IDictionary;
+            var pDict = parent as ManagedDictionary;
             if (pDict == null)
             {
                 throw new InvalidOperationException("Cannot merge with object of type [" + parent.GetType() + "]");
             }
             IDictionary merged = new ManagedDictionary();
+            {
+            	KeyTypeName = pDict.keyTypeName,
+                valueTypeName = pDict.valueTypeName
+            }
 	        foreach (DictionaryEntry dictionaryEntry in pDict)
 	        {
 	            merged[dictionaryEntry.Key] = dictionaryEntry.Value;
@@ -230,4 +234,4 @@ namespace Spring.Objects.Factory.Config
             return merged;
 	    }
 	}
-}
\ No newline at end of file
+}