diff --git a/gunicorn/config.py b/gunicorn/config.py
index f1a0870b..93386e27 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -47,7 +47,7 @@ class Config(object):
     def __init__(self, usage=None, prog=None):
         self.settings = make_settings()
         self.usage = usage
-        self.prog = prog or sys.argv[0]
+        self.prog = prog or os.path.basename(sys.argv[0])
 
     def __getattr__(self, name):
         if name not in self.settings: