#3614: Correct a typo in xmlrpc.client.
diff --git a/Lib/xmlrpc/client.py b/Lib/xmlrpc/client.py
index 121fedf..d18efce 100644
--- a/Lib/xmlrpc/client.py
+++ b/Lib/xmlrpc/client.py
@@ -1203,7 +1203,7 @@
         headers = {}
         if extra_headers:
             for key, val in extra_headers:
-                header[key] = val
+                headers[key] = val
         headers["Content-Type"] = "text/xml"
         headers["User-Agent"] = self.user_agent
         connection.request("POST", handler, request_body, headers)
@@ -1271,7 +1271,7 @@
         headers = {}
         if extra_headers:
             for key, val in extra_headers:
-                header[key] = val
+                headers[key] = val
         headers["Content-Type"] = "text/xml"
         headers["User-Agent"] = self.user_agent
         connection.request("POST", handler, request_body, headers)