diff --git a/setup.py b/setup.py
index af297feeb0..34fdc3833b 100644
--- a/setup.py
+++ b/setup.py
@@ -89,8 +89,7 @@ if os.name == 'nt':
         args['windows'][0]['other_resources'] = [(24, 1, manifest)]
 
 
-elif os.name == 'mac' \
-        or (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
+elif sys.platform == 'darwin':
     import py2app
     from modulegraph.find_modules import PY_SUFFIXES
     PY_SUFFIXES.append('')
@@ -253,8 +252,7 @@ if os.name == 'nt':
             Popen([makensis, "/DVERSION=" + VERSION,
                 str(os.path.join(os.path.dirname(__file__),
                     'setup-single.nsi'))]).wait()
-elif os.name == 'mac' \
-        or (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
+elif sys.platform == 'darwin':
     def find_gtk_dir():
         for directory in os.environ['PATH'].split(':'):
             if not os.path.isdir(directory):
diff --git a/tryton/common/common.py b/tryton/common/common.py
index ab0e4df1bb..4b09ed71e6 100644
--- a/tryton/common/common.py
+++ b/tryton/common/common.py
@@ -376,8 +376,7 @@ def file_open(filename, type, parent, print_p=False):
                     save_p.close()
                     file_p.close()
         return
-    elif os.name == 'mac' or \
-            (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
+    elif sys.platform == 'darwin':
         pid = os.fork()
         if not pid:
             pid = os.fork()
diff --git a/tryton/config.py b/tryton/config.py
index 32098f7765..2c3f532aed 100644
--- a/tryton/config.py
+++ b/tryton/config.py
@@ -30,8 +30,7 @@ if not os.path.isdir(get_config_dir()):
 def find_path(progs, args):
     if os.name == 'nt':
         return ''
-    if os.name == 'mac' or \
-            (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
+    if sys.platform == 'darwin':
         return ''
     paths = [x for x in os.environ['PATH'].split(':')
             if os.path.isdir(x)]
diff --git a/tryton/gui/main.py b/tryton/gui/main.py
index 134079728b..3098966d21 100644
--- a/tryton/gui/main.py
+++ b/tryton/gui/main.py
@@ -87,7 +87,7 @@ class Main(object):
                 gtk.gdk.CONTROL_MASK)
         gtk.accel_map_add_entry('<tryton>/File/Quit', gtk.keysyms.Q,
                 gtk.gdk.CONTROL_MASK)
-        if os.name != 'mac':
+        if sys.platform != 'darwin':
             gtk.accel_map_add_entry('<tryton>/User/Menu Reload', gtk.keysyms.T,
                     gtk.gdk.MOD1_MASK)
         gtk.accel_map_add_entry('<tryton>/User/Menu Toggle', gtk.keysyms.T,
@@ -191,8 +191,7 @@ class Main(object):
         self.sig_toolbar_show()
         self.sig_statusbar_show()
 
-        if os.name in ('nt', 'mac') or \
-                (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
+        if os.name == 'nt' or sys.platform == 'darwin':
             # Disable actions, on win32 we use os.startfile
             # and on mac we use /usr/bin/open
             self.menuitem_actions.set_sensitive(False)
diff --git a/tryton/gui/window/view_form/view/list.py b/tryton/gui/window/view_form/view/list.py
index 36e047ff68..ff459af822 100644
--- a/tryton/gui/window/view_form/view/list.py
+++ b/tryton/gui/window/view_form/view/list.py
@@ -351,9 +351,7 @@ class ViewList(ParserView):
         elif self.widget_tree.sequence:
             dnd = True
         # Disable DnD on mac until it is fully supported
-        if os.name == 'mac':
-            dnd = False
-        elif hasattr(os, 'uname') and os.uname()[0] == 'Darwin':
+        if sys.platform == 'darwin':
             dnd = False
         if screen.readonly:
             dnd = False
@@ -480,8 +478,7 @@ class ViewList(ParserView):
         # Don't use set_with_data on mac see:
         # http://bugzilla.gnome.org/show_bug.cgi?id=508601
         if selection.count_selected_rows() < 100 \
-                or os.name == 'mac' \
-                or (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
+                or sys.platform == 'darwin':
             data = []
             selection.selected_foreach(self.copy_foreach, data)
             clipboard.set_text('\n'.join(data))
diff --git a/tryton/translate.py b/tryton/translate.py
index b5a0ad94a5..54654d09c6 100644
--- a/tryton/translate.py
+++ b/tryton/translate.py
@@ -8,6 +8,7 @@ from version import PACKAGE
 from tryton.client import CURRENT_DIR, PREFIX
 import logging
 import gtk
+import sys
 
 _ = gettext.gettext
 
@@ -169,8 +170,7 @@ def setlang(lang=None, locale_dict=None):
             lang2 = lang
             if os.name == 'nt':
                 lang2 = _LOCALE2WIN32.get(lang, lang)
-            elif os.name == 'mac' or \
-                    (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
+            elif sys.platform == 'darwin':
                 encoding = 'UTF-8'
             # ensure environment variable are str
             lang, lang2, encoding = str(lang), str(lang2), str(encoding)