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-rw-r--r--synapse/rest/health.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/rest/health.py b/synapse/rest/health.py
index 4487b54abf..78df7af2cf 100644
--- a/synapse/rest/health.py
+++ b/synapse/rest/health.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 from twisted.web.resource import Resource
+from twisted.web.server import Request
 
 
 class HealthResource(Resource):
@@ -25,6 +26,6 @@ class HealthResource(Resource):
 
     isLeaf = 1
 
-    def render_GET(self, request):
+    def render_GET(self, request: Request) -> bytes:
         request.setHeader(b"Content-Type", b"text/plain")
         return b"OK"