diff --git a/apps/opencs/model/world/refcollection.cpp b/apps/opencs/model/world/refcollection.cpp
index 1d91bbd59..d8f6b391b 100644
--- a/apps/opencs/model/world/refcollection.cpp
+++ b/apps/opencs/model/world/refcollection.cpp
@@ -64,6 +64,7 @@ void CSMWorld::RefCollection::load (ESM::ESMReader& reader, int cellIndex, bool
 
         // ignore content file number
         std::map<ESM::RefNum, std::string>::iterator iter = cache.begin();
+        ref.mRefNum.mIndex = ref.mRefNum.mIndex & 0x00ffffff;
         for (; iter != cache.end(); ++iter)
         {
             if (ref.mRefNum.mIndex == iter->first.mIndex)