diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/sewerboss/DiamondGooRoom.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/sewerboss/DiamondGooRoom.java
index 5d7da1ffe..85efc0531 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/sewerboss/DiamondGooRoom.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/sewerboss/DiamondGooRoom.java
@@ -33,7 +33,9 @@ public class DiamondGooRoom extends GooBossRoom {
 	public void paint(Level level) {
 		Painter.fill( level, this, Terrain.WALL );
 		
-		int diamondWidth = 2 + width()%2;
+		//we want the end width to be width()-2, and the width will grow by a total of (height()-4 - height()%2)
+		int diamondWidth = width()-2 - (height()-4 - height()%2);
+		
 		for (int i = 1; i < height(); i++){
 			Painter.fill( level, left + (width() - diamondWidth)/2, top+i, diamondWidth, height()-2*i, Terrain.EMPTY);
 			diamondWidth += 2;