diff --git a/src/calibre/srv/loop.py b/src/calibre/srv/loop.py
index 742b4c7f68..4be6666944 100644
--- a/src/calibre/srv/loop.py
+++ b/src/calibre/srv/loop.py
@@ -6,7 +6,7 @@ from __future__ import (unicode_literals, division, absolute_import,
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
 
-import ssl, socket, select, os, traceback, time
+import ssl, socket, select, os, traceback
 from io import BytesIO
 from Queue import Empty, Full
 from functools import partial
@@ -580,7 +580,7 @@ class ServerLoop(object):
             pass
         for s, conn in tuple(self.connection_map.iteritems()):
             self.close(s, conn)
-        wait_till = time.time() + self.opts.shutdown_timeout
+        wait_till = monotonic() + self.opts.shutdown_timeout
         for pool in (self.plugin_pool, self.pool):
             pool.stop(wait_till)
             if pool.workers:
diff --git a/src/calibre/srv/pool.py b/src/calibre/srv/pool.py
index 3a3eae86f9..bb2e2e626a 100644
--- a/src/calibre/srv/pool.py
+++ b/src/calibre/srv/pool.py
@@ -6,10 +6,12 @@ from __future__ import (unicode_literals, division, absolute_import,
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
 
-import sys, time
+import sys
 from Queue import Queue, Full
 from threading import Thread
 
+from calibre.utils.monotonic import monotonic
+
 class Worker(Thread):
 
     daemon = True
@@ -67,7 +69,7 @@ class ThreadPool(object):
             except Full:
                 break
         for w in self.workers:
-            now = time.time()
+            now = monotonic()
             if now >= wait_till:
                 break
             w.join(wait_till - now)
@@ -113,7 +115,7 @@ class PluginPool(object):
                 except Exception:
                     self.loop.log.exception('Failed to stop plugin: %s', self.plugin_name(w.plugin))
         for w in self.workers:
-            left = wait_till - time.time()
+            left = wait_till - monotonic()
             if left > 0:
                 w.join(left)
             else: