diff --git a/gunicorn/__init__.py b/gunicorn/__init__.py
index 035497f0..6850288c 100644
--- a/gunicorn/__init__.py
+++ b/gunicorn/__init__.py
@@ -25,3 +25,4 @@ else:
 
 version_info = (0, 11, "1%s" % minor_tag)
 __version__ = ".".join(map(str, version_info))
+SERVER_SOFTWARE = "gunicorn/%s" % __version__
diff --git a/gunicorn/arbiter.py b/gunicorn/arbiter.py
index 9002af8c..9ee46658 100644
--- a/gunicorn/arbiter.py
+++ b/gunicorn/arbiter.py
@@ -18,7 +18,8 @@ from gunicorn.errors import HaltServer
 from gunicorn.pidfile import Pidfile
 from gunicorn.sock import create_socket
 from gunicorn import util
-from gunicorn import __version__
+
+from gunicorn import __version__, SERVER_SOFTWARE
 
 class Arbiter(object):
     """
@@ -52,7 +53,9 @@ class Arbiter(object):
     def __init__(self, app):
         self.log = logging.getLogger(__name__)
         self.log.info("Starting gunicorn %s" % __version__)
-        
+       
+        os.environ["SERVER_SOFTWARE"] = SERVER_SOFTWARE
+
         self.setup(app)
         
         self.pidfile = None
diff --git a/gunicorn/http/wsgi.py b/gunicorn/http/wsgi.py
index 6e8a4bfc..11db0199 100644
--- a/gunicorn/http/wsgi.py
+++ b/gunicorn/http/wsgi.py
@@ -9,10 +9,9 @@ import re
 import sys
 from urllib import unquote
 
-from gunicorn import __version__
+from gunicorn import SERVER_SOFTWARE
 import gunicorn.util as util
 
-SERVER_VERSION = "gunicorn/%s" % __version__
 NORMALIZE_SPACE = re.compile(r'(?:\r\n)?[ \t]+')
 
 log = logging.getLogger(__name__)
@@ -28,7 +27,7 @@ def create(req, sock, client, server, cfg):
         "wsgi.multiprocess": (cfg.workers > 1),
         "wsgi.run_once": False,
         "gunicorn.socket": sock,
-        "SERVER_SOFTWARE": SERVER_VERSION,
+        "SERVER_SOFTWARE": SERVER_SOFTWARE,
         "REQUEST_METHOD": req.method,
         "QUERY_STRING": req.query,
         "RAW_URI": req.uri,
@@ -112,7 +111,7 @@ class Response(object):
     def __init__(self, req, sock):
         self.req = req
         self.sock = sock
-        self.version = SERVER_VERSION
+        self.version = SERVER_SOFTWARE
         self.status = None
         self.chunked = False
         self.should_close = req.should_close()