Index: gcode.c
===================================================================
--- gcode.c	(revision 28094)
+++ gcode.c	(revision 28095)
@@ -277,7 +277,7 @@
 	/* Set entire array to 0 (don't export any layer groups by default */
 	memset(gcode_export_group, 0, sizeof(gcode_export_group));
 
-	for (n = 0; n < pcb_max_layer; n++) {
+	for (n = 0; n < pcb_max_layer(PCB); n++) {
 		unsigned int flags = pcb_layer_flags(PCB, n);
 		if (flags & PCB_LYT_SILK)
 			continue;