diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9336a8a..31b74f4d 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -144,6 +144,8 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android")
     set(UCLIENT_PLATFORM_LINUX ON)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     set(UCLIENT_PLATFORM_WINDOWS ON)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    set(UCLIENT_PLATFORM_MACOS ON)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Generic")
     if(PLATFORM_NAME STREQUAL "nuttx")
         set(UCLIENT_PLATFORM_NUTTX ON)
@@ -158,7 +160,7 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Generic")
     endif()
 endif()
 
-if(UCLIENT_PLATFORM_LINUX OR UCLIENT_PLATFORM_NUTTX OR UCLIENT_PLATFORM_ZEPHYR)
+if(UCLIENT_PLATFORM_LINUX OR UCLIENT_PLATFORM_MACOS OR UCLIENT_PLATFORM_NUTTX OR UCLIENT_PLATFORM_ZEPHYR)
     set(UCLIENT_PLATFORM_POSIX ON)
 endif()