Index: src/board.c
===================================================================
--- src/board.c	(revision 32000)
+++ src/board.c	(revision 32001)
@@ -409,6 +409,17 @@
 	return chg;
 }
 
+TODO("Move this to layer_grp.[ch]");
+const char *pcb_layergrp_thickness_attr(pcb_layergrp_t *grp, const char *namespace)
+{
+	const char *s = NULL;
+	if (namespace != NULL)
+		s = rnd_attribute_get_namespace(&grp->Attributes, namespace, "thickness");
+	if (s == NULL)
+		s = rnd_attribute_get(&grp->Attributes, "thickness");
+	return s;
+}
+
 rnd_coord_t pcb_stack_thickness(pcb_board_t *pcb, const char *namespace, pcb_board_thickness_flags_t flags, rnd_layergrp_id_t from, rnd_bool include_from, rnd_layergrp_id_t to, rnd_bool include_to, pcb_layer_type_t accept)
 {
 	rnd_layergrp_id_t gid;
@@ -433,11 +444,8 @@
 		if (!(grp->ltype & accept))
 			continue;
 
-		if (namespace != NULL)
-			s = rnd_attribute_get_namespace(&grp->Attributes, namespace, "thickness");
-		else
-			s = rnd_attribute_get(&grp->Attributes, "thickness");
 		curr = 0;
+		s = pcb_layergrp_thickness_attr(grp, namespace);
 		if (s != NULL)
 			curr = rnd_get_value(s, NULL, NULL, NULL);
 		if (curr <= 0) {