diff --git a/Misc/NEWS b/Misc/NEWS
index 1f6875d..3a4a6cc 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -181,6 +181,9 @@
 - Issue #13521: dict.setdefault() now does only one lookup for the given key,
   making it "atomic" for many purposes.  Patch by Filip Gruszczyński.
 
+- Issue #1602133: on Mac OS X a shared library build (``--enable-shared``)
+  now fills the ``os.environ`` variable correctly.
+
 - Issue #10538: When using the "s*" code with PyArg_ParseTuple() to fill a
   Py_buffer structure with data from an object supporting only the old
   PyBuffer interface, a reference to the source objects is now properly added
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 21a6739..d2742a0 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -441,9 +441,10 @@
 #endif
 
 /* Return a dictionary corresponding to the POSIX environment table */
-#ifdef WITH_NEXT_FRAMEWORK
+#if defined(WITH_NEXT_FRAMEWORK) || (defined(__APPLE__) && defined(Py_ENABLE_SHARED))
 /* On Darwin/MacOSX a shared library or framework has no access to
-** environ directly, we must obtain it with _NSGetEnviron().
+** environ directly, we must obtain it with _NSGetEnviron(). See also
+** man environ(7).
 */
 #include <crt_externs.h>
 static char **environ;
@@ -463,7 +464,7 @@
     d = PyDict_New();
     if (d == NULL)
         return NULL;
-#ifdef WITH_NEXT_FRAMEWORK
+#if defined(WITH_NEXT_FRAMEWORK) || (defined(__APPLE__) && defined(Py_ENABLE_SHARED))
     if (environ == NULL)
         environ = *_NSGetEnviron();
 #endif