diff --git a/gunicorn/config.py b/gunicorn/config.py
index 8f7752dc..bba7aea8 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -12,7 +12,7 @@ from gunicorn import util
 
 class Config(object):
     
-    DEFAULT_CONFIG_FILE = 'gunicorn.conf.py',
+    DEFAULT_CONFIG_FILE = 'gunicorn.conf.py'
     
     DEFAULTS = dict(
         backlog=2048,
@@ -42,7 +42,7 @@ class Config(object):
     def __init__(self, cmdopts, path=None):
         if not path:
             self.config_file = os.path.join(os.getcwd(), 
-                                            self.DEFAULT_CONFIG_FILE)
+                                    self.DEFAULT_CONFIG_FILE)
         else:
             self.config_file =  os.path.abspath(os.path.normpath(path))
         self.cmdopts = cmdopts    
diff --git a/gunicorn/pidfile.py b/gunicorn/pidfile.py
index a1294835..7252375d 100644
--- a/gunicorn/pidfile.py
+++ b/gunicorn/pidfile.py
@@ -3,6 +3,7 @@
 # This file is part of gunicorn released under the MIT license. 
 # See the NOTICE for more information.
 
+import errno
 import os
 import tempfile
 
@@ -24,7 +25,7 @@ class Pidfile(object):
                 return path
             raise RuntimeError("Already running on PID %s " \
                         "(or pid file '%s' is stale)" % (os.getpid(), path))
-        if instane._pidfile:    
+        if instance._pidfile:    
             self.unlink_pidfile(instance, instance._pidfile)
 
         # write pidfile