diff --git a/code/game/gamemodes/game_mode.dm b/code/game/gamemodes/game_mode.dm
index 2d5b1be7fdc..49e58c0a03a 100644
--- a/code/game/gamemodes/game_mode.dm
+++ b/code/game/gamemodes/game_mode.dm
@@ -401,7 +401,7 @@
 	var/list/heads = list()
 	for(var/mob/living/carbon/human/player in mob_list)
 		if(player.stat!=2 && player.mind && (player.mind.assigned_role in command_positions))
-			heads += player.mind
+			heads |= player.mind
 	return heads
 
 
@@ -412,7 +412,7 @@
 	var/list/heads = list()
 	for(var/mob/player in mob_list)
 		if(player.mind && (player.mind.assigned_role in command_positions))
-			heads += player.mind
+			heads |= player.mind
 	return heads
 
 //////////////////////////