Index: src/pcb-gpmi/gpmi_plugin/gpmi_pkg/layout/coord.c
===================================================================
--- src/pcb-gpmi/gpmi_plugin/gpmi_pkg/layout/coord.c	(revision 999)
+++ src/pcb-gpmi/gpmi_plugin/gpmi_pkg/layout/coord.c	(revision 1000)
@@ -13,7 +13,7 @@
 
 const char *current_grid_unit()
 {
-	Unit *u = Settings.grid_unit;
+	const Unit *u = Settings.grid_unit;
 	if (u == NULL)
 		return "";
 	return u->suffix;