--- a/src/town_cmd.cpp	Tue Jul 03 11:31:38 2007 +0000
+++ b/src/town_cmd.cpp	Tue Jul 03 15:24:50 2007 +0000
@@ -1896,6 +1896,7 @@
 	if (flags & DC_EXEC) {
 		DeleteName(t->townnametype);
 		t->townnametype = str;
+		t->townnamegrfid = 0;
 
 		UpdateTownVirtCoord(t);
 		_town_sort_dirty = true;