diff --git a/cmake/modules/DuneTestMacros.cmake b/cmake/modules/DuneTestMacros.cmake
index b7f01f026572be700d320918a2530dc531a6804a..1e95bfbad1d9c19ae4dedbdf885c71c0c458cce9 100644
--- a/cmake/modules/DuneTestMacros.cmake
+++ b/cmake/modules/DuneTestMacros.cmake
@@ -199,7 +199,7 @@ function(dune_add_test)
   if(NOT ADDTEST_MPI_RANKS)
     set(ADDTEST_MPI_RANKS 1)
   endif()
-  if((ADDTEST_MPI_RANKS > 1) AND (NOT ADDTEST_TIMEOUT))
+  if(ADDTEST_MPI_RANKS AND (NOT ADDTEST_TIMEOUT))
     message(FATAL_ERROR "dune_add_test: You need to specify the TIMEOUT parameter if using the MPI_RANKS parameter.")
   endif()
   if(NOT ADDTEST_TIMEOUT)