diff --git a/misc/schema/xrc_schema.rnc b/misc/schema/xrc_schema.rnc
index 0e18bd04f3..a7a42d491a 100644
--- a/misc/schema/xrc_schema.rnc
+++ b/misc/schema/xrc_schema.rnc
@@ -1551,7 +1551,7 @@ wxSizer_item =
         [xrc:p="o"] element cellspan {_, t_size }* &
         [xrc:p="o"] element flag     {_,
             xsd:string {
-                pattern = "(wxLEFT|wxRIGHT|wxTOP|wxBOTTOM|wxNORTH|wxSOUTH|wxEAST|wxWEST|wxALL|wxGROW|wxEXPAND|wxSHAPED|wxSTRETCH_NOT|wxALIGN_CENTER|wxALIGN_CENTRE|wxALIGN_LEFT|wxALIGN_RIGHT|wxALIGN_TOP|wxALIGN_BOTTOM|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTRE_HORIZONTAL|wxALIGN_CENTER_VERTICAL|wxALIGN_CENTRE_VERTICAL)( *\| *(wxLEFT|wxRIGHT|wxTOP|wxBOTTOM|wxNORTH|wxSOUTH|wxEAST|wxWEST|wxALL|wxGROW|wxEXPAND|wxSHAPED|wxSTRETCH_NOT|wxALIGN_CENTER|wxALIGN_CENTRE|wxALIGN_LEFT|wxALIGN_RIGHT|wxALIGN_TOP|wxALIGN_BOTTOM|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTRE_HORIZONTAL|wxALIGN_CENTER_VERTICAL|wxALIGN_CENTRE_VERTICAL))*"
+                pattern = "(wxLEFT|wxRIGHT|wxTOP|wxBOTTOM|wxNORTH|wxSOUTH|wxEAST|wxWEST|wxALL|wxGROW|wxEXPAND|wxSHAPED|wxSTRETCH_NOT|wxALIGN_CENTER|wxALIGN_CENTRE|wxALIGN_LEFT|wxALIGN_RIGHT|wxALIGN_TOP|wxALIGN_BOTTOM|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTRE_HORIZONTAL|wxALIGN_CENTER_VERTICAL|wxALIGN_CENTRE_VERTICAL|wxRESERVE_SPACE_EVEN_IF_HIDDEN)( *\| *(wxLEFT|wxRIGHT|wxTOP|wxBOTTOM|wxNORTH|wxSOUTH|wxEAST|wxWEST|wxALL|wxGROW|wxEXPAND|wxSHAPED|wxSTRETCH_NOT|wxALIGN_CENTER|wxALIGN_CENTRE|wxALIGN_LEFT|wxALIGN_RIGHT|wxALIGN_TOP|wxALIGN_BOTTOM|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTRE_HORIZONTAL|wxALIGN_CENTER_VERTICAL|wxALIGN_CENTRE_VERTICAL|wxRESERVE_SPACE_EVEN_IF_HIDDEN))*"
             }
         }*
     }