diff --git a/Tests/RunCMake/Instrumentation/RunCMakeTest.cmake b/Tests/RunCMake/Instrumentation/RunCMakeTest.cmake
index 7d53b41ca0..cb94fb172f 100644
--- a/Tests/RunCMake/Instrumentation/RunCMakeTest.cmake
+++ b/Tests/RunCMake/Instrumentation/RunCMakeTest.cmake
@@ -66,7 +66,9 @@ function(instrument test)
     run_cmake_command(${test}-build ${CMAKE_COMMAND} --build . --config Debug)
   endif()
   if (ARGS_BUILD_MAKE_PROGRAM)
+    set(RunCMake_TEST_OUTPUT_MERGE 1)
     run_cmake_command(${test}-make-program ${RunCMake_MAKE_PROGRAM})
+    unset(RunCMake_TEST_OUTPUT_MERGE)
   endif()
   if (ARGS_INSTALL)
     run_cmake_command(${test}-install ${CMAKE_COMMAND} --install . --prefix install --config Debug)