1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/appservice/__init__.py b/synapse/appservice/__init__.py
index f7baf578f0..d9ca856c8b 100644
--- a/synapse/appservice/__init__.py
+++ b/synapse/appservice/__init__.py
@@ -62,7 +62,7 @@ class ApplicationService(object):
 
     def _matches_regex(self, test_string, namespace_key):
         if not isinstance(test_string, basestring):
-            logger.warning(
+            logger.error(
                 "Expected a string to test regex against, but got %s",
                 test_string
             )