diff --git a/slixmpp/xmlstream/xmlstream.py b/slixmpp/xmlstream/xmlstream.py
index 18143f87..426d5472 100644
--- a/slixmpp/xmlstream/xmlstream.py
+++ b/slixmpp/xmlstream/xmlstream.py
@@ -800,6 +800,8 @@ class XMLStream(asyncio.BaseProtocol):
 
             self.ssl_context.verify_mode = ssl.CERT_REQUIRED
             self.ssl_context.load_verify_locations(cafile=ca_cert)
+        else:
+            self.ssl_context.set_default_verify_paths()
 
         return self.ssl_context