diff --git a/src/NETGENPlugin/NETGENPluginDC.py b/src/NETGENPlugin/NETGENPluginDC.py
index 9e77075..6012a00 100644
--- a/src/NETGENPlugin/NETGENPluginDC.py
+++ b/src/NETGENPlugin/NETGENPluginDC.py
@@ -17,7 +17,7 @@
 # See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
 #
 
-from smesh import Mesh_Algorithm, AssureGeomPublished, ParseParameters
+from smesh import Mesh_Algorithm, AssureGeomPublished, ParseParameters, IsEqual
 
 # import NETGENPlugin module if possible
 noNETGENPlugin = 0