Index: hpgl.c
===================================================================
--- hpgl.c	(revision 12266)
+++ hpgl.c	(revision 12267)
@@ -60,7 +60,7 @@
 		for(n = old_len; n < data->LayerN; n++) {
 			memset(&data->Layer[n], 0, sizeof(pcb_layer_t));
 			pcb_layer_real2bound(&data->Layer[n], &PCB->Data->Layer[n], 0);
-			free(data->Layer[n].name);
+			free((char *)data->Layer[n].name);
 			data->Layer[n].name = pcb_strdup_printf("hpgl_pen_%d", n);
 			data->Layer[n].parent = data;
 		}