diff --git a/src/GEOMGUI/GEOM_Displayer.cxx b/src/GEOMGUI/GEOM_Displayer.cxx
index 61b86c34c..7f778b23e 100644
--- a/src/GEOMGUI/GEOM_Displayer.cxx
+++ b/src/GEOMGUI/GEOM_Displayer.cxx
@@ -820,7 +820,7 @@ void GEOM_Displayer::Update( SALOME_VTKPrs* prs )
   }
   else
   {
-    bool isVector;
+    bool isVector = false;
     if (myType == GEOM_VECTOR) isVector = true;
     theActors = GEOM_AssemblyBuilder::BuildActors( myShape, 0, 0, Standard_True, isVector );
   }