diff --git a/backslash/api.py b/backslash/api.py
index 7833122..99c2783 100644
--- a/backslash/api.py
+++ b/backslash/api.py
@@ -33,6 +33,7 @@
 _RETRY_STATUS_CODES = frozenset([
     requests.codes.bad_gateway,
     requests.codes.gateway_timeout,
+    requests.codes.server_error,
 ])
 
 _TYPES_BY_TYPENAME = {