diff --git a/MCGalaxy/Drawing/DrawOps/TorusDrawOp.cs b/MCGalaxy/Drawing/DrawOps/TorusDrawOp.cs
index dd0e326ef..c10b72cd4 100644
--- a/MCGalaxy/Drawing/DrawOps/TorusDrawOp.cs
+++ b/MCGalaxy/Drawing/DrawOps/TorusDrawOp.cs
@@ -26,7 +26,7 @@ namespace MCGalaxy.Drawing.Ops {
         public override long BlocksAffected(Level lvl, Vec3S32[] marks) {
             double rx = (Max.X - Min.X) / 2.0 + 0.25, ry = (Max.Y - Min.Y) / 2.0 + 0.25, rz = (Max.Z - Min.Z) / 2.0 + 0.25;
             double rTube = ry, rCentre = Math.Min(rx, rz) - rTube;
-            return (int)(2 * Math.PI * Math.PI * rTube * rTube * rCentre);
+            return (int)(2 * Math.PI * Math.PI * rTube * rTube * Math.Abs(rCentre));
         }
         
         public override void Perform(Vec3S32[] marks, Brush brush, Action<DrawOpBlock> output) {