diff --git a/gui/privatesign_info.cc b/gui/privatesign_info.cc
index a295a9837..2a0a2a4a3 100644
--- a/gui/privatesign_info.cc
+++ b/gui/privatesign_info.cc
@@ -17,6 +17,7 @@ privatesign_info_t::privatesign_info_t(roadsign_t* s) :
 	obj_infowin_t(s),
 	sign(s)
 {
+	buf.clear();
 	for(  int i=0;  i<PLAYER_UNOWNED;  i++  ) {
 		if(  welt->get_player(i)  ) {
 			players[i].init( button_t::square_state, welt->get_player(i)->get_name());