diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Thorns.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Thorns.java
index 04c051139..200e7ea41 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Thorns.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/armor/glyphs/Thorns.java
@@ -41,7 +41,7 @@ public class Thorns extends Armor.Glyph {
 		// lvl 1 - 23.1%
 		// lvl 2 - 28.5%
 		float procChance = (level+2f)/(level+12f) * procChanceMultiplier(defender);
-		if ( Random.Float() < procChance ) {
+		if ( attacker.alignment != defender.alignment && Random.Float() < procChance ) {
 
 			float powerMulti = Math.max(1f, procChance);