diff --git a/src/Components/Modules/ZoneBuilder.cpp b/src/Components/Modules/ZoneBuilder.cpp
index f4e0c2aa..4b39de2f 100644
--- a/src/Components/Modules/ZoneBuilder.cpp
+++ b/src/Components/Modules/ZoneBuilder.cpp
@@ -283,7 +283,15 @@ namespace Components
 		asset.header.data = ptr;
 		asset.type = type;
 
+		const auto& cmp = asset.header.data;
+
+		if(std::find_if(this->markedAssets.begin(), this->markedAssets.end(), [&cmp] (const Game::XAsset& s) { return cmp == s.header.data; } ) != this->markedAssets.end())
+		{
+			return; // don't re-mark assets
+		}
+
 		AssetHandler::ZoneMark(asset, this);
+		this->markedAssets.push_back(asset);
 	}
 
 	void ZoneBuilder::Zone::writeZone()
diff --git a/src/Components/Modules/ZoneBuilder.hpp b/src/Components/Modules/ZoneBuilder.hpp
index b16b461c..63c0d308 100644
--- a/src/Components/Modules/ZoneBuilder.hpp
+++ b/src/Components/Modules/ZoneBuilder.hpp
@@ -75,11 +75,11 @@ namespace Components
 
 			std::vector<Game::XAsset> loadedAssets;
 			std::vector<Game::XAssetHeader> savedAssets;
+			std::vector<Game::XAsset> markedAssets;
 			std::vector<std::string> scriptStrings;
 			std::map<unsigned short, unsigned int> scriptStringMap;
 			std::map<std::string, std::string> renameMap[Game::XAssetType::ASSET_TYPE_COUNT];
 			std::map<const void*, uint32_t> pointerMap;
-			std::vector<uint32_t> aliasBaseStack;
 			std::map<const void*, uint32_t> aliasMap;
 
 			Game::RawFile branding;