diff --git a/src/main/java/net/minecraftforge/client/model/obj/ObjLoader.java b/src/main/java/net/minecraftforge/client/model/obj/ObjLoader.java
index 3c2bf40eb8..b06c4569ef 100644
--- a/src/main/java/net/minecraftforge/client/model/obj/ObjLoader.java
+++ b/src/main/java/net/minecraftforge/client/model/obj/ObjLoader.java
@@ -31,8 +31,8 @@ public class ObjLoader implements IGeometryLoader<ObjModel>, ResourceManagerRelo
 {
     public static ObjLoader INSTANCE = new ObjLoader();
 
-    private final Map<ObjModel.ModelSettings, ObjModel> modelCache = Maps.newHashMap();
-    private final Map<ResourceLocation, ObjMaterialLibrary> materialCache = Maps.newHashMap();
+    private final Map<ObjModel.ModelSettings, ObjModel> modelCache = Maps.newConcurrentMap();
+    private final Map<ResourceLocation, ObjMaterialLibrary> materialCache = Maps.newConcurrentMap();
 
     private ResourceManager manager = Minecraft.getInstance().getResourceManager();