Index: code/ai/aibig.cpp
===================================================================
--- code/ai/aibig.cpp	(revision 9509)
+++ code/ai/aibig.cpp	(working copy)
@@ -424,7 +424,7 @@
 
 			aip->path_goal_dist = 5;
 			subsys_path_num = aip->targeted_subsys->system_info->path_num;
-			if ( ((aip->path_start) == -1 || (aip->mp_index != subsys_path_num)) && subsys_path_num <= pm->n_paths ) {
+			if ( ((aip->path_start) == -1 || (aip->mp_index != subsys_path_num)) && subsys_path_num <= pm_t->n_paths ) {
 				// maybe create a new path
 				if ( subsys_path_num >= 0 ) {
 					Assert(aip->target_objnum >= 0);