diff --git a/OpenRA.Game/WPos.cs b/OpenRA.Game/WPos.cs
index 0966d6c849..6ea08e0b78 100644
--- a/OpenRA.Game/WPos.cs
+++ b/OpenRA.Game/WPos.cs
@@ -65,8 +65,10 @@ namespace OpenRA
 
 			// Add an additional quadratic variation to height
 			// Uses decimal to avoid integer overflow
-			var offset = (int)((decimal)(b - a).Length * pitch.Tan() * mul * (div - mul) / (1024 * div * div));
-			return new WPos(ret.X, ret.Y, ret.Z + offset);
+			var offset = (decimal)(b - a).Length * pitch.Tan() * mul * (div - mul) / (1024 * div * div);
+			var clampedOffset = (int)(offset + (decimal)ret.Z).Clamp<decimal>((decimal)int.MinValue, (decimal)int.MaxValue);
+
+			return new WPos(ret.X, ret.Y, clampedOffset);
 		}
 
 		public override int GetHashCode() { return X.GetHashCode() ^ Y.GetHashCode() ^ Z.GetHashCode(); }