diff --git a/02-incns-solver/incns-solver.ipynb b/02-incns-solver/incns-solver.ipynb
index 382beffb915c9e2445813f26289cf5102187b63a..c3dac41e2163dca6e1a2944aeec0fd77649a7031 100644
--- a/02-incns-solver/incns-solver.ipynb
+++ b/02-incns-solver/incns-solver.ipynb
@@ -528,7 +528,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!NekMesh -v -m extract:surf=5,6,7,8 cyl2DMesh.xml WallBndSurf.xml"
+    "!NekMesh -v -f -m extract:surf=5,6,7,8 cyl2DMesh.xml WallBndSurf.xml"
    ]
   },
   {