diff --git a/apps/openmw/mwworld/class.cpp b/apps/openmw/mwworld/class.cpp
index d241278d1..59fc86d0d 100644
--- a/apps/openmw/mwworld/class.cpp
+++ b/apps/openmw/mwworld/class.cpp
@@ -358,7 +358,7 @@ namespace MWWorld
     Class::copyToCell(const Ptr &ptr, CellStore &cell) const
     {
         Ptr newPtr = copyToCellImpl(ptr, cell);
-
+        newPtr.getCellRef().unsetRefNum(); // This RefNum is only valid within the original cell of the reference
         return newPtr;
     }