diff --git a/CMakeLists.txt b/CMakeLists.txt
index 02ac2fa7fd24d09443eb550dfe3bd39dc9df2bb1..22c3b4dcb7f0f311dc992197421611681962b4a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1038,7 +1038,7 @@ if(KWSYS_STANDALONE OR CMake_SOURCE_DIR)
     if(CTEST_TEST_KWSYS)
       configure_file("${CMAKE_CURRENT_SOURCE_DIR}/ExtraTest.cmake.in"
         "${CMAKE_CURRENT_BINARY_DIR}/ExtraTest.cmake")
-      set_directory_properties(PROPERTIES TEST_INCLUDE_FILE "${CMAKE_CURRENT_BINARY_DIR}/ExtraTest.cmake")
+      set_property(DIRECTORY APPEND PROPERTY TEST_INCLUDE_FILES "${CMAKE_CURRENT_BINARY_DIR}/ExtraTest.cmake")
     endif()
 
     set(KWSYS_TEST_ARGS_testCommandLineArguments