diff --git a/Misc/NEWS.d/next/macOS/2020-04-07-01-39-52.bpo-40060.9Y0s-a.rst b/Misc/NEWS.d/next/macOS/2020-04-07-01-39-52.bpo-40060.9Y0s-a.rst
new file mode 100644
index 000000000000000..3c8884a5652292d
--- /dev/null
+++ b/Misc/NEWS.d/next/macOS/2020-04-07-01-39-52.bpo-40060.9Y0s-a.rst
@@ -0,0 +1 @@
+Expose socket.TCP_NOTSENT_LOWAT on macOS in official builds
\ No newline at end of file
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 580ac0af5aff59c..b0c81a8c86d7451 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -8228,6 +8228,11 @@ PyInit__socket(void)
 #ifdef  TCP_USER_TIMEOUT
     PyModule_AddIntMacro(m, TCP_USER_TIMEOUT);
 #endif
+#ifndef TCP_NOTSENT_LOWAT
+# ifdef __APPLE__
+#  define TCP_NOTSENT_LOWAT 0x201
+# endif
+#endif
 #ifdef  TCP_NOTSENT_LOWAT
     PyModule_AddIntMacro(m, TCP_NOTSENT_LOWAT);
 #endif