diff --git a/test/implicit/2pdfm/CMakeLists.txt b/test/implicit/2pdfm/CMakeLists.txt
index 48b24999876c403e01690dabc8813489d4506f30..a9c17deb7a4f0554d33f3ffff9b074cb35041e56 100644
--- a/test/implicit/2pdfm/CMakeLists.txt
+++ b/test/implicit/2pdfm/CMakeLists.txt
@@ -7,3 +7,4 @@ add_dumux_test(test_2pdfm test_2pdfm test_2pdfm.cc
   -ParameterFile ${CMAKE_CURRENT_SOURCE_DIR}/test_2pdfm.input
   -Grid.File ${CMAKE_CURRENT_SOURCE_DIR}/grids/2pdfmartmesh.net)
 add_dune_ug_flags(test_2pdfm)
+add_dune_mpi_flags(test_2pdfm)
diff --git a/test/implicit/mpnc/CMakeLists.txt b/test/implicit/mpnc/CMakeLists.txt
index 056201fd15c8a07941900fc15730ec9d903350b8..7a82c48de162a449246319f4fc35b96dd031c589 100644
--- a/test/implicit/mpnc/CMakeLists.txt
+++ b/test/implicit/mpnc/CMakeLists.txt
@@ -52,3 +52,4 @@ add_dumux_test(test_boxmpnckinetic test_boxmpnckinetic test_boxmpnckinetic.cc
   -TimeManager.DtInitial 1e-2)
 add_dune_alugrid_flags(test_boxmpnckinetic)
 add_dune_ug_flags(test_boxmpnckinetic)
+add_dune_mpi_flags(test_boxmpnckinetic)