Fix incorrect reference to StringIO

This was introduced in 4f2f5171

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/util/logformatter.py b/synapse/util/logformatter.py

index 59ab3c6968..3e42868ea9 100644
--- a/synapse/util/logformatter.py
+++ b/synapse/util/logformatter.py
@@ -32,7 +32,7 @@ class LogFormatter(logging.Formatter):
         super(LogFormatter, self).__init__(*args, **kwargs)
 
     def formatException(self, ei):
-        sio = StringIO.StringIO()
+        sio = StringIO()
         (typ, val, tb) = ei
 
         # log the stack above the exception capture point if possible, but