diff --git a/pyzabbix/sender.py b/pyzabbix/sender.py
index <HASH>..<HASH> 100644
--- a/pyzabbix/sender.py
+++ b/pyzabbix/sender.py
@@ -125,7 +125,7 @@ class ZabbixMetric(object):
     def __repr__(self):
         """Represent detailed ZabbixMetric view."""
 
-        result = json.dumps(self.__dict__)
+        result = json.dumps(self.__dict__, ensure_ascii=False)
         logger.debug('%s: %s', self.__class__.__name__, result)
 
         return result
Fixes utf-8 issues