diff --git a/src/SMESHGUI/SMESHGUI_Hypotheses.cxx b/src/SMESHGUI/SMESHGUI_Hypotheses.cxx
index 7d2d2561c..b073f0815 100644
--- a/src/SMESHGUI/SMESHGUI_Hypotheses.cxx
+++ b/src/SMESHGUI/SMESHGUI_Hypotheses.cxx
@@ -152,6 +152,7 @@ bool SMESHGUI_GenericHypothesisCreator::editHypothesis( SMESH::SMESH_Hypothesis_
     Dlg->setObjectName( theHypName );
     Dlg->setHIcon( icon() );
     Dlg->setType( type() );
+    Dlg->setMinimumSize( 300, Dlg->minimumSizeHint().height() );
     retrieveParams();
     Dlg->show();
     if ( !myEventLoop )