diff --git a/src/session_p.h b/src/session_p.h
index 8ddcefe..69fea73 100644
--- a/src/session_p.h
+++ b/src/session_p.h
@@ -62,6 +62,7 @@
     uint16_t key_count;
 
     /* SSH authentication callbacks */
+    int (*auth_hostkey_check)(const char *hostname, ssh_session session);
     char *(*auth_password)(const char *, const char *);
     char *(*auth_interactive)(const char *, const char *, const char *, int);
     char *(*auth_privkey_passphrase)(const char *);