diff --git a/python3/examples/XenAPI/XenAPI.py b/python3/examples/XenAPI/XenAPI.py
index 68701c8f16..e62d0b7673 100644
--- a/python3/examples/XenAPI/XenAPI.py
+++ b/python3/examples/XenAPI/XenAPI.py
@@ -118,6 +118,7 @@ def with_tracecontext(self):
             for k, v in headers.items():
                 self.add_extra_header(k, v)
     def make_connection(self, host):
+        self._extra_headers = []
         self.with_tracecontext()
 
         originator_k = "ORIGINATOR"