diff --git a/sygnal/gcmpushkin.py b/sygnal/gcmpushkin.py
index fd87c02a..0f13a5fb 100644
--- a/sygnal/gcmpushkin.py
+++ b/sygnal/gcmpushkin.py
@@ -205,7 +205,7 @@ def __init__(self, name: str, sygnal: "Sygnal", config: Dict[str, Any]) -> None:
         if proxy_url:
             os.environ["HTTP_PROXY"] = proxy_url
             os.environ["HTTPS_PROXY"] = proxy_url
-            self._session = aiohttp.ClientSession(trust_env=True)
+            self._session = aiohttp.ClientSession(trust_env=True, auto_decompress=False)
 
     @classmethod
     async def create(