diff --git a/lecture/mhs/groundwater/CMakeLists.txt b/lecture/mhs/groundwater/CMakeLists.txt
index 0439e9f3b11581c6889e6a9978b77992b59b8f0b..b12551676cb893b56be60f09f9a4c7369013e084 100644
--- a/lecture/mhs/groundwater/CMakeLists.txt
+++ b/lecture/mhs/groundwater/CMakeLists.txt
@@ -1,5 +1,5 @@
 add_input_file_links()
-dune_symlink_to_source_files(FILES "contourPlots.py")
+dune_symlink_to_source_files(FILES "contourplots.py")
 
 dumux_add_test(NAME groundwater
               SOURCES groundwater.cc
diff --git a/lecture/mhs/groundwater/contourPlots.py b/lecture/mhs/groundwater/contourplots.py
similarity index 100%
rename from lecture/mhs/groundwater/contourPlots.py
rename to lecture/mhs/groundwater/contourplots.py