diff --git a/cmake/test_harness/test_harness.cmake b/cmake/test_harness/test_harness.cmake
index 641322684..c869013e7 100644
--- a/cmake/test_harness/test_harness.cmake
+++ b/cmake/test_harness/test_harness.cmake
@@ -102,13 +102,13 @@ macro(Cabana_add_tests)
         if(_device STREQUAL THREADS OR _device STREQUAL OPENMP)
           foreach(_thread ${CABANA_UNIT_TEST_NUMTHREADS})
             add_test(NAME ${_target}_nt_${_thread} COMMAND
-                    ${NONMPI_PRECOMMAND} $<TARGET_FILE:${_target}> ${gtest_args} --kokkos-threads=${_thread})
+                    ${NONMPI_PRECOMMAND} $<TARGET_FILE:${_target}> ${gtest_args} --kokkos-num-threads=${_thread})
             if(_device STREQUAL OPENMP)
               set_property(TEST ${_target}_nt_${_thread} PROPERTY ENVIRONMENT OMP_NUM_THREADS=${_thread})
             endif()
             if(VALGRIND_FOUND)
               add_test(NAME ${_target}_nt_${_thread}_valgrind COMMAND
-                ${NONMPI_PRECOMMAND} ${VALGRIND_EXECUTABLE} ${VALGRIND_ARGS} $<TARGET_FILE:${_target}> ${gtest_args} --kokkos-threads=${_thread})
+                ${NONMPI_PRECOMMAND} ${VALGRIND_EXECUTABLE} ${VALGRIND_ARGS} $<TARGET_FILE:${_target}> ${gtest_args} --kokkos-num-threads=${_thread})
               if(_device STREQUAL OPENMP)
                 set_property(TEST ${_target}_nt_${_thread}_valgrind PROPERTY ENVIRONMENT OMP_NUM_THREADS=${_thread})
               endif()