diff --git a/simplomon.hh b/simplomon.hh
index 45cbcf2..56a7786 100644
--- a/simplomon.hh
+++ b/simplomon.hh
@@ -239,6 +239,7 @@ private:
 
   std::string d_method;
   std::string d_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36";
+  std::string d_cert_pubkey;
 };