diff --git a/rhodecode/__init__.py b/rhodecode/__init__.py
--- a/rhodecode/__init__.py
+++ b/rhodecode/__init__.py
@@ -58,5 +58,5 @@ except ImportError:
 __author__ = 'Marcin Kuzminski'
 __url__ = 'http://rhodecode.org'
 
-is_windows = __platform__ in ('Windows')
+is_windows = __platform__ in ['Windows']
 is_unix = not is_windows
diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@ callback = lambda V: ('.'.join(map(str, 
 # defines current platform
 __platform__ = platform.system()
 
-is_windows = __platform__ in ('Windows')
+is_windows = __platform__ in ['Windows']
 
 requirements = [
     "waitress==0.8.2",