Index: code/missionui/missionbrief.cpp
===================================================================
--- code/missionui/missionbrief.cpp	(revision 8679)
+++ code/missionui/missionbrief.cpp	(working copy)
@@ -814,10 +814,7 @@
 	// completely clear out the old entries (if any) so we don't access them by mistake - taylor
 	if ( before > Briefing->num_stages ) {
 		for ( i = Briefing->num_stages; i < before; i++ ) {
-			Briefing->stages[i].formula = -1;
-			Briefing->stages[i].flags = 0;
-			Briefing->stages[i].text = "";
-			Briefing->stages[i].num_lines = 0;
+			Briefing->stages[i] = brief_stage();
 		}
 	}