diff --git a/src/userauth.c b/src/userauth.c
index 7bbf5716..913a00be 100644
--- a/src/userauth.c
+++ b/src/userauth.c
@@ -1613,9 +1613,9 @@ userauth_keyboard_interactive(LIBSSH2_SESSION * session,
         LIBSSH2_FREE(session, session->userauth_kybd_responses);
         session->userauth_kybd_responses = NULL;
         LIBSSH2_FREE(session, session->userauth_kybd_auth_name);
-		session->userauth_kybd_auth_name = NULL;
+        session->userauth_kybd_auth_name = NULL;
         LIBSSH2_FREE(session, session->userauth_kybd_auth_instruction);
-		session->userauth_kybd_auth_instruction = NULL;
+        session->userauth_kybd_auth_instruction = NULL;
 
         if (session->userauth_kybd_auth_failure) {
             session->userauth_kybd_state = libssh2_NB_state_idle;