diff --git a/Tests/RunCMake/CTestCommandLine/RunCMakeTest.cmake b/Tests/RunCMake/CTestCommandLine/RunCMakeTest.cmake
index 2e5156cd6a..22a8d20f9e 100644
--- a/Tests/RunCMake/CTestCommandLine/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CTestCommandLine/RunCMakeTest.cmake
@@ -1,5 +1,8 @@
 include(RunCMake)
 
+unset(ENV{CTEST_PARALLEL_LEVEL})
+unset(ENV{CTEST_OUTPUT_ON_FAILURE})
+
 run_cmake_command(repeat-until-fail-bad1
   ${CMAKE_CTEST_COMMAND} --repeat-until-fail
   )