diff --git a/gunicorn/instrument/statsd.py b/gunicorn/instrument/statsd.py
index 1efe77a7..e0c6882e 100644
--- a/gunicorn/instrument/statsd.py
+++ b/gunicorn/instrument/statsd.py
@@ -108,7 +108,7 @@ class Statsd(Logger):
         self._sock_send("{0}{1}:{2}|c|@{3}".format(self.prefix, name, value, sampling_rate))
 
     def decrement(self, name, value, sampling_rate=1.0):
-        self._sock_send("{0){1}:-{2}|c|@{3}".format(self.prefix, name, value, sampling_rate))
+        self._sock_send("{0}{1}:-{2}|c|@{3}".format(self.prefix, name, value, sampling_rate))
 
     def histogram(self, name, value):
         self._sock_send("{0}{1}:{2}|ms".format(self.prefix, name, value))