diff --git a/include/armadillo_bits/sp_auxlib_meat.hpp b/include/armadillo_bits/sp_auxlib_meat.hpp
index dbfdf2d7..9b508bf3 100644
--- a/include/armadillo_bits/sp_auxlib_meat.hpp
+++ b/include/armadillo_bits/sp_auxlib_meat.hpp
@@ -2062,6 +2062,7 @@ sp_auxlib::run_aupd_plain
     arma_ignore(n_eigvals);
     arma_ignore(which);
     arma_ignore(X);
+    arma_ignore(Xst);
     arma_ignore(sym);
     arma_ignore(n);
     arma_ignore(tol);