diff --git a/src/GEOMGUI/GEOM_Displayer.cxx b/src/GEOMGUI/GEOM_Displayer.cxx
index 55cbc43bb..a3c3aff6d 100644
--- a/src/GEOMGUI/GEOM_Displayer.cxx
+++ b/src/GEOMGUI/GEOM_Displayer.cxx
@@ -321,11 +321,16 @@ GEOM_Displayer::GEOM_Displayer( SalomeApp_Study* st )
   myToActivate = true;
   // This parameter is used for activisation/deactivisation of objects to be displayed
   
-  // Activate parallel vizualisation only for testiong purpose  
+  #if OCC_VERSION_LARGE > 0x06050100 // Functionnality available only in OCCT 6.5.2
+  // Activate parallel vizualisation only for testing purpose  
   // and if the corresponding env variable is set to 1 
   char* parallel_visu = getenv("PARALLEL_VISU");
   if (parallel_visu && atoi(parallel_visu))
+  {
+    MESSAGE("Parallel visualisation on");
     BRepMesh_IncrementalMesh::SetParallelDefault(Standard_True);
+  }
+  #endif
 
   myViewFrame = 0;
 }