diff --git a/src/alien.cpp b/src/alien.cpp
index 47b5561..491aae5 100644
--- a/src/alien.cpp
+++ b/src/alien.cpp
@@ -946,7 +946,7 @@ bool alien_place(object *alien)
 	if (currentGame.area == MISN_MARS)
 	{
 		alien->x = screen->w;
-		alien->y = RANDRANGE(screen->h / 3, (2 * screen->h) / 3);
+		alien->y = RANDRANGE(-screen->h / 3, (4 * screen->h) / 3);
 	}
 
 	for (int i = 0 ; i < ALIEN_MAX ; i++)
diff --git a/src/game.cpp b/src/game.cpp
index 120391a..7c2f06c 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -854,7 +854,7 @@ int mainGameLoop()
 						}
 					}
 
-					if ((currentGame.area == MISN_MARS) && (alien->x < -300))
+					if ((currentGame.area == MISN_MARS) && (alien->x < -60))
 						alien->active = false;
 				}
 				else