diff --git a/src/Refitter.Core/SchemaCleaner.cs b/src/Refitter.Core/SchemaCleaner.cs
index 75cb6a794..be48b07be 100644
--- a/src/Refitter.Core/SchemaCleaner.cs
+++ b/src/Refitter.Core/SchemaCleaner.cs
@@ -194,6 +194,11 @@ private IEnumerable<JsonSchema> EnumerateSchema(JsonSchema? schema)
                 }
             }
 
+            if (schema.DictionaryKey != null)
+            {
+                yield return schema.DictionaryKey;
+            }
+
             if (schema.Item != null)
             {
                 yield return schema.Item;