diff --git a/src/GUI/NETGENPluginGUI_HypothesisCreator.cxx b/src/GUI/NETGENPluginGUI_HypothesisCreator.cxx
index 930a5d3..5b530c6 100644
--- a/src/GUI/NETGENPluginGUI_HypothesisCreator.cxx
+++ b/src/GUI/NETGENPluginGUI_HypothesisCreator.cxx
@@ -165,7 +165,7 @@ QFrame* NETGENPluginGUI_HypothesisCreator::buildFrame()
 
   aGroupLayout->addWidget( new QLabel( tr( "NETGEN_GROWTH_RATE" ), GroupC1 ), row, 0 );
   myGrowthRate = new SMESHGUI_SpinBox( GroupC1 );
-  myGrowthRate->RangeStepAndValidator( .1, 10., .1, "parametric_precision" );
+  myGrowthRate->RangeStepAndValidator( .0001, 10., .1, "parametric_precision" );
   aGroupLayout->addWidget( myGrowthRate, row, 1 );
   row++;