diff --git a/src/05-poisson-problem.cc b/src/05-poisson-problem.cc
index 9bb4eebec912fcc8198f036a87ac526d865005e7..3101efacb2c882607133d2a699e91ccb3bac3918 100644
--- a/src/05-poisson-problem.cc
+++ b/src/05-poisson-problem.cc
@@ -134,7 +134,7 @@ int main(int argc, char** argv)
 
     Dune::VTKWriter<GridView> vtkWriter(gridView);
     vtkWriter.addVertexData(x, "solution");
-    vtkWriter.write("05-poisson-solution");
+    vtkWriter.write("05-solution");
 
     return 0;
   }
diff --git a/src/06-interpolation.cc b/src/06-interpolation.cc
index 9ca3afbe88728eeb2cf1e3d14e116ec508132f0a..6cd7cce14122e0c28d4953cfd5cdc29373b0c05e 100644
--- a/src/06-interpolation.cc
+++ b/src/06-interpolation.cc
@@ -187,7 +187,7 @@ int main(int argc, char** argv)
 
     Dune::VTKWriter<GridView> vtkWriter(gridView);
     vtkWriter.addVertexData(x, "solution");
-    vtkWriter.write("06-interpolation");
+    vtkWriter.write("06-solution");
 
     return 0;
   }