diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index d1f7b6979b..bb92c149a5 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -2019,7 +2019,7 @@ if(BUILD_TESTING)
       )
   endif()
 
-  if(MAKE_SUPPORTS_SPACES AND NOT CMAKE_GENERATOR STREQUAL "Xcode")
+  if(MAKE_SUPPORTS_SPACES AND NOT CMAKE_GENERATOR STREQUAL "Xcode" AND NOT CMAKE_GENERATOR STREQUAL "Watcom WMake")
     add_test(SubDirSpaces ${CMAKE_CTEST_COMMAND}
       --build-and-test
       "${CMake_SOURCE_DIR}/Tests/SubDirSpaces"