diff --git a/src/02-basic-grid-interface.cc b/src/02-basic-grid-interface.cc
index 7cfbdbeac4a37f32cc70416cc4b60ff5e789f4ce..19630905a3f3cc120e288adf45ddae673b5dd9a6 100644
--- a/src/02-basic-grid-interface.cc
+++ b/src/02-basic-grid-interface.cc
@@ -67,7 +67,7 @@ int main(int argc, char** argv)
 
     using GridView = decltype(gridView);
     Dune::VTKWriter<GridView> vtkWriter(gridView);
-    vtkWriter.write("01-refined-grid");
+    vtkWriter.write("02-basic-grid-interface");
 
     return 0;
   }
diff --git a/src/03-function-integration.cc b/src/03-function-integration.cc
index d32971c2f12894d292ccc2b5602974301e3057cf..9a6db5efc0aded8451e26827fb614e992a6d1d55 100644
--- a/src/03-function-integration.cc
+++ b/src/03-function-integration.cc
@@ -104,7 +104,7 @@ int main(int argc, char** argv)
 
     using GridView = decltype(gridView);
     Dune::VTKWriter<GridView> vtkWriter(gridView);
-    vtkWriter.write("01-refined-grid");
+    vtkWriter.write("03-function-integration");
 
     return 0;
   }