From ad075165b325c9ff81636b9c336cc5fc5e2ed97b Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 17 Mar 2021 10:28:25 +0100
Subject: [PATCH] Use the correct file extension.

---
 examples/step-15/step-15.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/step-15/step-15.cc b/examples/step-15/step-15.cc
index 86b0674c64..eeab634d80 100644
--- a/examples/step-15/step-15.cc
+++ b/examples/step-15/step-15.cc
@@ -660,7 +660,7 @@ namespace Step15
         data_out.build_patches();
 
         const std::string filename =
-          "solution-" + Utilities::int_to_string(refinement_cycle, 2) + ".vtk";
+          "solution-" + Utilities::int_to_string(refinement_cycle, 2) + ".vtu";
         std::ofstream output(filename);
         data_out.write_vtu(output);
 
-- 
2.39.5