diff --git a/contrib/win32/win32compat/ssh-agent/agentconfig.c b/contrib/win32/win32compat/ssh-agent/agentconfig.c
index 954e4e062..dddada984 100644
--- a/contrib/win32/win32compat/ssh-agent/agentconfig.c
+++ b/contrib/win32/win32compat/ssh-agent/agentconfig.c
@@ -56,6 +56,19 @@ struct passwd *privsep_pw = NULL;
 static char *config_file_name = _PATH_SERVER_CONFIG_FILE;
 int auth_sock = -1;
 
+int
+auth2_key_already_used(Authctxt *authctxt, const struct sshkey *key) 
+{
+	return 0;
+}
+
+void
+auth2_record_key(Authctxt *authctxt, int authenticated,
+	const struct sshkey *key)
+{
+	return;
+}
+
 int
 auth2_methods_valid(const char * c, int i) {
 	return 1;