diff --git a/lib/connect.c b/lib/connect.c
index e0b7401471..9bcf525ebb 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -623,6 +623,7 @@ void Curl_persistconninfo(struct Curl_easy *data, struct connectdata *conn,
   data->info.conn_scheme = conn->handler->scheme;
   data->info.conn_protocol = conn->handler->protocol;
   data->info.conn_primary_port = conn->port;
+  data->info.conn_remote_port = conn->remote_port;
   data->info.conn_local_port = local_port;
 }
 
diff --git a/lib/urldata.h b/lib/urldata.h
index ef2174d9e7..9c34ec444c 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1160,7 +1160,11 @@ struct PureInfo {
      reused, in the connection cache. */
 
   char conn_primary_ip[MAX_IPADR_LEN];
-  int conn_primary_port;
+  int conn_primary_port; /* this is the destination port to the connection,
+                            which might have been a proxy */
+  int conn_remote_port;  /* this is the "remote port", which is the port
+                            number of the used URL, independent of proxy or
+                            not */
   char conn_local_ip[MAX_IPADR_LEN];
   int conn_local_port;
   const char *conn_scheme;