diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/Mob.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/Mob.java
index 344bf7bf2..cd7256d3c 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/Mob.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/Mob.java
@@ -678,8 +678,8 @@ public abstract class Mob extends Char {
 
 	public boolean surprisedBy( Char enemy, boolean attacking ){
 		return enemy == Dungeon.hero
-				&& (enemy.invisible > 0 || !enemySeen)
-				&& (!attacking || ((Hero)enemy).canSurpriseAttack());
+				&& (enemy.invisible > 0 || !enemySeen || (fieldOfView != null && !fieldOfView[enemy.pos]))
+				&& (!attacking || enemy.canSurpriseAttack());
 	}
 
 	public void aggro( Char ch ) {