diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -191,7 +191,6 @@ static void NewGRFAddDlgWndProc(Window *
 						GRFConfig *c = CallocT<GRFConfig>(1);
 						*c = *src;
 						c->filename = strdup(src->filename);
-						if (src->full_path != NULL) c->full_path = strdup(src->full_path);
 						if (src->name      != NULL) c->name      = strdup(src->name);
 						if (src->info      != NULL) c->info      = strdup(src->info);
 						c->next = NULL;