diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 49382177..a0312416 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -3625,6 +3625,13 @@ class Net_SSH2
      */
     function getServerPublicHostKey()
     {
+        if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) {
+            $this->bitmap |= NET_SSH2_MASK_CONSTRUCTOR;
+            if (!$this->_connect()) {
+                return false;
+            }
+        }
+
         $signature = $this->signature;
         $server_public_host_key = $this->server_public_host_key;