diff --git a/source/core/shape/ovus.cpp b/source/core/shape/ovus.cpp
index 00f9e02e0..00ba0a218 100644
--- a/source/core/shape/ovus.cpp
+++ b/source/core/shape/ovus.cpp
@@ -981,7 +981,7 @@ void Ovus::CalcUV(const Vector3d& IPoint, Vector2d& Result) const
         theta = 0;
 
     Result[U] = theta;
-    Result[V] = phi;
+    Result[V] = 1.0-phi;
 
 }