Index: trunk/src_plugins/export_stl/export_stl.c
===================================================================
--- trunk/src_plugins/export_stl/export_stl.c	(revision 38429)
+++ trunk/src_plugins/export_stl/export_stl.c	(revision 38430)
@@ -238,7 +238,7 @@
 
 	/* collect cutouts **/
 	{
-		pcb_topoly_cutout_opts_t opts;
+		pcb_topoly_cutout_opts_t opts = {0};
 
 		opts.pstk_omit_slot_poly = !options[HA_slotpoly].lng;
 		opts.pstk_min_drill_dia = options[HA_mindrill].crd;