diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 791871e12c..2e57a16a5f 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -803,7 +803,7 @@ if (WIN32)
 endif ()
 
 # Watcom support
-if(WIN32 OR CMAKE_SYSTEM_NAME STREQUAL "Linux")
+if(WIN32 OR CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   set_property(SOURCE cmake.cxx APPEND PROPERTY COMPILE_DEFINITIONS CMAKE_USE_WMAKE)
   list(APPEND SRCS
     cmGlobalWatcomWMakeGenerator.cxx