diff --git a/aetcd3/client.py b/aetcd3/client.py
index 4e979cc..7717f8c 100644
--- a/aetcd3/client.py
+++ b/aetcd3/client.py
@@ -186,6 +186,7 @@ async def open(self):
             else:
                 self.channel._ssl.load_cert_chain(self.ca_cert, keyfile=self.cert_key)
 
+            self.channel._ssl.load_verify_locations(cafile=self.ca_cert)
             self.uses_secure_channel = True
         else:
             self.uses_secure_channel = False