diff --git a/swift/common/memcached.py b/swift/common/memcached.py
index e232e404f8..71fa7519dc 100644
--- a/swift/common/memcached.py
+++ b/swift/common/memcached.py
@@ -190,6 +190,32 @@ class MemcacheRing(object):
 except Exception, e:
 self._exception_occurred(server, e)
 
+ def decr(self, key, delta=1, timeout=0):
+ """
+ Decrements a key which has a numeric value by delta.
+ If the key can't be found, it's added as 0. Memcached
+ will treat data values below 0 as 0 with incr/decr.
+
+ :param key: key
+ :param delta: amount to subtract to the value of key (or set
+ as the value if the key is not found)
+ :param timeout: ttl in memcache
+ """
+ key = md5hash(key)
+ for (server, fp, sock) in self._get_conns(key):
+ try:
+ sock.sendall('decr %s %s\r\n' % (key, delta))
+ line = fp.readline().strip().split()
+ if line[0].upper() == 'NOT_FOUND':
+ line[0] = '0'
+ sock.sendall('add %s %d %d %s noreply\r\n%s\r\n' %
+ (key, 0, timeout, len(line[0]), line[0]))
+ ret = int(line[0].strip())
+ self._return_conn(server, fp, sock)
+ return ret
+ except Exception, e:
+ self._exception_occurred(server, e)
+
 def delete(self, key):
 """
 Deletes a key/value pair from memcache.
diff --git a/swift/common/middleware/ratelimit.py b/swift/common/middleware/ratelimit.py
index ca0cd6e427..fea11ae811 100644
--- a/swift/common/middleware/ratelimit.py
+++ b/swift/common/middleware/ratelimit.py
@@ -148,7 +148,7 @@ class RateLimitMiddleware(object):
 max_sleep_m = self.max_sleep_time_seconds * self.clock_accuracy
 if max_sleep_m - need_to_sleep_m <= self.clock_accuracy * 0.01:
 # treat as no-op decrement time
- self.memcache_client.incr(key, delta=-time_per_request_m)
+ self.memcache_client.decr(key, delta=time_per_request_m)
 raise MaxSleepTimeHit("Max Sleep Time Exceeded: %s" %
 need_to_sleep_m)
 
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