diff --git a/gunicorn/config.py b/gunicorn/config.py
index 3188bc26..39ab6786 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -18,7 +18,7 @@ class Config(object):
         loglevel='info',
         pidfile=None,
         workers=1,
-        umask=0,
+        umask="0",
         user=None,
         group=None,
         
diff --git a/gunicorn/main.py b/gunicorn/main.py
index e6925681..b07de48c 100644
--- a/gunicorn/main.py
+++ b/gunicorn/main.py
@@ -24,7 +24,7 @@ LOG_LEVELS = {
     "debug": logging.DEBUG
 }
 
-UMASK = 0
+UMASK = "0"
 
 def options():
     """ build command lines options passed to OptParse object """