diff --git a/lib/linked_in/communications.rb b/lib/linked_in/communications.rb
index 9ad8332..dcc7e9d 100644
--- a/lib/linked_in/communications.rb
+++ b/lib/linked_in/communications.rb
@@ -22,7 +22,7 @@ class Communications < APIResource
     #  message
     # @return [void]
     def send_message(subject, body, recipient_paths)
-      path = "/people/~/mailbox"
+      path = "/people/~/mailbox?oauth2_access_token=#{@connection.params[:oauth2_access_token]}"
 
       message = {
         subject: subject,