diff --git a/Tests/RunCMake/Autogen_6/RunCMakeTest.cmake b/Tests/RunCMake/Autogen_6/RunCMakeTest.cmake
index 65d58a957f..d18c9effae 100644
--- a/Tests/RunCMake/Autogen_6/RunCMakeTest.cmake
+++ b/Tests/RunCMake/Autogen_6/RunCMakeTest.cmake
@@ -12,6 +12,7 @@ if (DEFINED with_qt_version)
     macro(set_test_variables_for_unwanted_builds)
       if (RunCMake_GENERATOR MATCHES "Ninja")
         set(RunCMake_TEST_EXPECT_stdout "ninja: no work to do.")
+        set(RunCMake_TEST_EXPECT_stderr "((^|\n)ninja explain:[^\n]*)*$")
       elseif (RunCMake_GENERATOR MATCHES "Make")
         set(RunCMake_TEST_NOT_EXPECT_stdout "Building CXX object multi_ui_files/CMakeFiles/example.dir/src/main.cpp.o|\
                                              Building CXX object multi_ui_files/CMakeFiles/example.dir/src/widget.cpp.o")
@@ -29,6 +30,9 @@ if (DEFINED with_qt_version)
       if (NOT RunCMake_GENERATOR MATCHES "Visual Studio")
         set(test_verbose_arg "--verbose")
       endif()
+      if(RunCMake_GENERATOR MATCHES "Ninja")
+        set(ninja_explain_arg -- -d explain)
+      endif()
       if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
         set(config_desc "-${test_config}")
         set(RunCMake_TEST_VARIANT_DESCRIPTION "${config_desc}")
@@ -46,7 +50,7 @@ if (DEFINED with_qt_version)
 
       set(RunCMake_TEST_VARIANT_DESCRIPTION "${config_desc}-No files were built on the third build")
       set_test_variables_for_unwanted_builds()
-      run_cmake_command("${test_name}-build" ${CMAKE_COMMAND} --build . ${test_verbose_arg} ${multiconfig_config_arg})
+      run_cmake_command("${test_name}-build" ${CMAKE_COMMAND} --build . ${test_verbose_arg} ${multiconfig_config_arg} ${ninja_explain_arg})
     endfunction()
 
     if(RunCMake_GENERATOR MATCHES "Make|Ninja|Visual Studio|Xcode")