diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Stone.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Stone.java
index 6ceec1356..618e14315 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Stone.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Stone.java
@@ -24,6 +24,7 @@ package com.shatteredpixel.shatteredpixeldungeon.items.armor.glyphs;
 import com.shatteredpixel.shatteredpixeldungeon.actors.Char;
 import com.shatteredpixel.shatteredpixeldungeon.items.armor.Armor;
 import com.shatteredpixel.shatteredpixeldungeon.sprites.ItemSprite;
+import com.watabou.utils.GameMath;
 
 public class Stone extends Armor.Glyph {
 
@@ -45,7 +46,8 @@ public class Stone extends Armor.Glyph {
 		}
 		
 		//75% of dodge chance is applied as damage reduction
-		hitChance = (1f + 3f*hitChance)/4f;
+		// we clamp in case accuracy or evasion were negative
+		hitChance = GameMath.gate(0.25f, (1f + 3f*hitChance)/4f, 1f);
 		
 		damage = (int)Math.ceil(damage * hitChance);