diff --git a/XmlSchemaClassGenerator/Generator.cs b/XmlSchemaClassGenerator/Generator.cs
index c38a3e8a..8b9b6757 100644
--- a/XmlSchemaClassGenerator/Generator.cs
+++ b/XmlSchemaClassGenerator/Generator.cs
@@ -188,8 +188,8 @@ public void Generate(IEnumerable<string> files)
             }));
 
             foreach (var s in schemas)
-            {
-                Set.Add(s);
+            {                    
+                Set.Add(s.TargetNamespace, s.SourceUri);
             }
 
             Set.Compile();