diff --git a/THANKS b/THANKS
index cee470eb..800302f2 100644
--- a/THANKS
+++ b/THANKS
@@ -9,3 +9,4 @@ Eric Florenzano <floguy@gmail.com>
 Johan Bergström <bugs@bergstroem.nu>
 Xavier Grangier <grangier@gmail.com>
 Sergey Shepelev <temotor@gmail.com>
+Chris Dent <chris.dent@gmail.com>
diff --git a/gunicorn/http/response.py b/gunicorn/http/response.py
index 002f191a..7552d289 100644
--- a/gunicorn/http/response.py
+++ b/gunicorn/http/response.py
@@ -53,5 +53,7 @@ class Response(object):
         write(self.req.socket, arg, self.chunked)
 
     def close(self):
+        if not self.headers_sent:
+            self.send_headers()
         if self.chunked:
             write_chunk(self.socket, "")
\ No newline at end of file