diff --git a/VISU_SRC_5.1.3/src/CONVERTOR/VISU_MergeFilterUtilities.cxx b/VISU_SRC_5.1.3/src/CONVERTOR/VISU_MergeFilterUtilities.cxx
index 126effb..26b0a60 100755
--- a/VISU_SRC_5.1.3/src/CONVERTOR/VISU_MergeFilterUtilities.cxx
+++ b/VISU_SRC_5.1.3/src/CONVERTOR/VISU_MergeFilterUtilities.cxx
@@ -731,6 +731,8 @@ namespace VISU
     vtkDataArray *anIDMapper = aFieldData->GetArray(theFieldName);
     return dynamic_cast<vtkIntArray*>(anIDMapper);
   }
+  // Explicit instantiation to avoid linker errors
+  template vtkIntArray* GetIDMapper<TGetPointData>(TFieldList*, TGetPointData, const char* );
 
 
   //---------------------------------------------------------------