diff --git a/tryton/common/common.py b/tryton/common/common.py
index 9090dcc54a..4f7d30dab3 100644
--- a/tryton/common/common.py
+++ b/tryton/common/common.py
@@ -265,7 +265,8 @@ def file_open(filename, type, parent, print_p=False):
             # Try without operation, it is not supported on version < 2.5
             os.startfile(os.path.normpath(filename))
         return
-    elif os.name == 'mac' or os.uname()[0] == 'Darwin':
+    elif os.name == 'mac' or \
+            (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
         pid = os.fork()
         if not pid:
             pid = os.fork()
diff --git a/tryton/gui/main.py b/tryton/gui/main.py
index 5d38ddfad3..d5b3db8d81 100644
--- a/tryton/gui/main.py
+++ b/tryton/gui/main.py
@@ -183,7 +183,8 @@ class Main(object):
 
         self.sig_mode()
 
-        if os.name in ('nt', 'mac') or os.uname()[0] == 'Darwin':
+        if os.name in ('nt', 'mac') or \
+                (hasattr(os, 'uname') and os.uname()[0] == '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/translate.py b/tryton/translate.py
index 543ee858b4..8b91dd06fe 100644
--- a/tryton/translate.py
+++ b/tryton/translate.py
@@ -169,7 +169,8 @@ def setlang(lang=None, locale_dict=None):
             if os.name == 'nt':
                 lang2 = _LOCALE2WIN32.get(lang, lang)
                 os.environ['LANG'] = lang
-            elif os.name == 'mac' or os.uname()[0] == 'Darwin':
+            elif os.name == 'mac' or \
+                    (hasattr(os, 'uname') and os.uname()[0] == 'Darwin'):
                 encoding = 'UTF-8'
             locale.setlocale(locale.LC_ALL, str(lang2 + '.' + encoding))
         except: