diff --git a/src/game.cpp b/src/game.cpp
index e995dfd..edfc0a9 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1041,7 +1041,7 @@ static void game_doAliens()
 
 				if ((game.area == MISN_ELLESH) &&
 						((aliens[i].classDef == CD_BOSS) ||
-						    game.difficulty != DIFFICULTY_ORIGINAL))
+						    (game.difficulty != DIFFICULTY_ORIGINAL)))
 					aliens[i].face = 0;
 
 				if ((aliens[i].flags & FL_DEPLOYDRONES) && ((rand() % 300) == 0))