diff --git a/src/SMESH/SMESH_Algo.hxx b/src/SMESH/SMESH_Algo.hxx
index 4b681dc0a..1ed9cde25 100644
--- a/src/SMESH/SMESH_Algo.hxx
+++ b/src/SMESH/SMESH_Algo.hxx
@@ -290,7 +290,7 @@ public:
     * \retval const SMDS_MeshNode* - found node or NULL
    */
   static const SMDS_MeshNode* VertexNode(const TopoDS_Vertex& V,
-                                         SMESHDS_Mesh*        meshDS);
+                                         const SMESHDS_Mesh* meshDS);
 
 protected: