diff --git a/bin/mac/printenv.py b/bin/mac/printenv.py
index 8bbd9e789c3f..984cf1b87e28 100755
--- a/bin/mac/printenv.py
+++ b/bin/mac/printenv.py
@@ -12,6 +12,8 @@ if len(sys.argv) != 2:
 f = open(sys.argv[1], 'w')
 try:
     for key, value in os.environ.items():
+        if isinstance(key, unicode): key = key.encode('utf-8')
+        if isinstance(value, unicode): value = value.encode('utf-8')
         f.writelines([key, '=', value, '\0'])
 finally:
     f.close()