diff --git a/src/ZoneCommon/Zone/Definition/ZoneDefinition.h b/src/ZoneCommon/Zone/Definition/ZoneDefinition.h
index 08b1a1df..515013d1 100644
--- a/src/ZoneCommon/Zone/Definition/ZoneDefinition.h
+++ b/src/ZoneCommon/Zone/Definition/ZoneDefinition.h
@@ -42,7 +42,7 @@ public:
     void AddProperty(std::string key, std::string value);
     void Include(const ZoneDefinitionProperties& otherProperties);
 
-    std::unordered_map<std::string, std::string> m_properties;
+    std::unordered_multimap<std::string, std::string> m_properties;
 };
 
 class ZoneDefinition