diff --git a/gunicorn/instrument/statsd.py b/gunicorn/instrument/statsd.py
index 2d519c47..8565a256 100644
--- a/gunicorn/instrument/statsd.py
+++ b/gunicorn/instrument/statsd.py
@@ -89,8 +89,8 @@ class Statsd(Logger):
         request_time is a datetime.timedelta
         """
         Logger.access(self, resp, req, environ, request_time)
-        duration_in_s = request_time.seconds + float(request_time.microseconds)/10**6
-        self.histogram("gunicorn.request.duration", duration_in_s)
+        duration_in_ms = request_time.seconds * 1000 + float(request_time.microseconds)/10**3
+        self.histogram("gunicorn.request.duration", duration_in_ms)
         self.increment("gunicorn.requests", 1)
         self.increment("gunicorn.request.status.%d" % int(resp.status.split()[0]), 1)
 
diff --git a/tests/test_010-statsd.py b/tests/test_010-statsd.py
index f2ba1a4e..bc30266e 100644
--- a/tests/test_010-statsd.py
+++ b/tests/test_010-statsd.py
@@ -74,6 +74,6 @@ def test_instrument():
     logger.sock.reset()
 
     logger.access(MockResponse("200 OK"), None, {}, timedelta(seconds=7))
-    t.eq(logger.sock.msgs[0], "gunicorn.request.duration:7.0|ms")
+    t.eq(logger.sock.msgs[0], "gunicorn.request.duration:7000.0|ms")
     t.eq(logger.sock.msgs[1], "gunicorn.requests:1|c|@1.0")
     t.eq(logger.sock.msgs[2], "gunicorn.request.status.200:1|c|@1.0")