diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 0ba8646..5766b23 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -502,6 +502,12 @@
 	/* Cleanup Unicode implementation */
 	_PyUnicode_Fini();
 
+	/* reset file system default encoding */
+	if (!Py_HasFileSystemDefaultEncoding) {
+		free((char*)Py_FileSystemDefaultEncoding);
+        	Py_FileSystemDefaultEncoding = NULL;
+	}
+
 	/* XXX Still allocated:
 	   - various static ad-hoc pointers to interned strings
 	   - int and float free list blocks