diff --git a/test/implicit/1p/CMakeLists.txt b/test/implicit/1p/CMakeLists.txt
index 29802643a2b2b9baef30dfb00f97b4936c94769e..41e631e5e1986e6dcea62956ed9fd2f5bb0d39bd 100644
--- a/test/implicit/1p/CMakeLists.txt
+++ b/test/implicit/1p/CMakeLists.txt
@@ -60,8 +60,8 @@ add_dumux_test(test_cc1pniconvection test_cc1pniconvection test_cc1pniconvection
 add_dumux_test(test_box1p1d3d test_box1p1d3d test_box1p1d3d.cc
   ${CMAKE_SOURCE_DIR}/bin/runTest.sh
   ${CMAKE_SOURCE_DIR}/bin/fuzzycomparevtu.py
-  ${CMAKE_SOURCE_DIR}/test/references/1ptestbox1d3d-reference.vtu
-  ${CMAKE_CURRENT_BINARY_DIR}/1ptestbox1d3d-00002.vtu
+  ${CMAKE_SOURCE_DIR}/test/references/1ptestbox1d3d-reference.vtp
+  ${CMAKE_CURRENT_BINARY_DIR}/1ptestbox1d3d-00002.vtp
   ${CMAKE_CURRENT_BINARY_DIR}/test_box1p1d3d)
 add_dune_alberta_flags(test_box1p1d3d GRIDDIM 1 WORLDDIM 3)
 
@@ -76,8 +76,8 @@ add_dune_alberta_flags(test_box1p2d3d GRIDDIM 2 WORLDDIM 3)
 add_dumux_test(test_cc1p1d3d test_cc1p1d3d test_cc1p1d3d.cc
   ${CMAKE_SOURCE_DIR}/bin/runTest.sh
   ${CMAKE_SOURCE_DIR}/bin/fuzzycomparevtu.py
-  ${CMAKE_SOURCE_DIR}/test/references/1ptestcc1d3d-reference.vtu
-  ${CMAKE_CURRENT_BINARY_DIR}/1ptestcc1d3d-00002.vtu
+  ${CMAKE_SOURCE_DIR}/test/references/1ptestcc1d3d-reference.vtp
+  ${CMAKE_CURRENT_BINARY_DIR}/1ptestcc1d3d-00002.vtp
   ${CMAKE_CURRENT_BINARY_DIR}/test_cc1p1d3d)
 add_dune_alberta_flags(test_cc1p1d3d GRIDDIM 1 WORLDDIM 3)