1 files changed, 1 insertions, 1 deletions
diff --git a/tests/server.py b/tests/server.py
index 5a1b66270f..5a85d5fe7f 100644
--- a/tests/server.py
+++ b/tests/server.py
@@ -74,7 +74,7 @@ class FakeChannel:
         return int(self.result["code"])
 
     @property
-    def headers(self):
+    def headers(self) -> Headers:
         if not self.result:
             raise Exception("No result yet.")
         h = Headers()