diff --git a/tutorials/incompressible/pisoFoam/les/motorBike/motorBike/system/streamLines b/tutorials/incompressible/pisoFoam/les/motorBike/motorBike/system/streamLines
index aa0b6a1d7b..e5f7497292 100644
--- a/tutorials/incompressible/pisoFoam/les/motorBike/motorBike/system/streamLines
+++ b/tutorials/incompressible/pisoFoam/les/motorBike/motorBike/system/streamLines
@@ -17,7 +17,7 @@ streamLines
     setFormat       vtk; //gnuplot; //xmgr; //raw; //jplot; //csv; //ensight;
 
     // Velocity field to use for tracking.
-    U U;
+    UName U;
 
     // Tracked forwards (+U) or backwards (-U)
     trackForward    true;