diff --git a/src/BOPCol/BOPCol_NCVector.hxx b/src/BOPCol/BOPCol_NCVector.hxx
index a23c8c4563..5995d16818 100644
--- a/src/BOPCol/BOPCol_NCVector.hxx
+++ b/src/BOPCol/BOPCol_NCVector.hxx
@@ -45,7 +45,7 @@ template <class Type> class BOPCol_NCVector
   Type& Append1 ()
   {
     Type& anAppended = 
-      *(Type* )expandV (NCollection_BaseCollection<Type>::myAllocator, 
+      *(Type* )NCollection_BaseVector::expandV (NCollection_BaseCollection<Type>::myAllocator, 
 			NCollection_Vector<Type>::myLength);
     return anAppended;
   }