1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py
index 01931f29cc..0f970850e8 100644
--- a/synapse/storage/registration.py
+++ b/synapse/storage/registration.py
@@ -575,7 +575,7 @@ class RegistrationStore(RegistrationWorkerStore,
         def _find_next_generated_user_id(txn):
             txn.execute("SELECT name FROM users")
 
-            regex = re.compile("^@(\d+):")
+            regex = re.compile(r"^@(\d+):")
 
             found = set()