diff --git a/include/armadillo_bits/glue_times_meat.hpp b/include/armadillo_bits/glue_times_meat.hpp
index 4cf9eab0..29671d40 100644
--- a/include/armadillo_bits/glue_times_meat.hpp
+++ b/include/armadillo_bits/glue_times_meat.hpp
@@ -119,7 +119,7 @@ glue_times_redirect2_helper<true>::apply(Mat<typename T1::elem_type>& out, const
     
     arma_conform_assert_mul_size(A, B, "matrix multiplication");
     
-    const bool is_sym = (strip_inv<T1>::do_inv_spd) ? false : ( arma_config::optimise_sym && (auxlib::crippled_lapack(A) == false) && sym_helper::is_approx_sym(A) );
+    const bool is_sym = (strip_inv<T1>::do_inv_spd) ? false : ( arma_config::optimise_sym && (auxlib::crippled_lapack(A) == false) && sym_helper::is_approx_sym(A, uword(100)) );
     
     const bool status = (strip_inv<T1>::do_inv_spd) ? auxlib::solve_sympd_fast(out, A, B) : ( (is_sym) ? auxlib::solve_sym_fast(out, A, B) : auxlib::solve_square_fast(out, A, B) );
     
@@ -280,7 +280,7 @@ glue_times_redirect3_helper<true>::apply(Mat<typename T1::elem_type>& out, const
       if(is_cx<eT>::yes)  { arma_warn(1, "inv_sympd(): given matrix is not hermitian"); }
       }
     
-    const bool is_sym = (strip_inv<T1>::do_inv_spd) ? false : ( arma_config::optimise_sym && (auxlib::crippled_lapack(A) == false) && sym_helper::is_approx_sym(A) );
+    const bool is_sym = (strip_inv<T1>::do_inv_spd) ? false : ( arma_config::optimise_sym && (auxlib::crippled_lapack(A) == false) && sym_helper::is_approx_sym(A, uword(100)) );
     
     const bool status = (strip_inv<T1>::do_inv_spd) ? auxlib::solve_sympd_fast(out, A, BC) : ( (is_sym) ? auxlib::solve_sym_fast(out, A, BC) : auxlib::solve_square_fast(out, A, BC) );
     
@@ -319,7 +319,7 @@ glue_times_redirect3_helper<true>::apply(Mat<typename T1::elem_type>& out, const
     
     Mat<eT> solve_result;
     
-    const bool is_sym = (strip_inv<T1>::do_inv_spd) ? false : ( arma_config::optimise_sym && (auxlib::crippled_lapack(B) == false) && sym_helper::is_approx_sym(B) );
+    const bool is_sym = (strip_inv<T1>::do_inv_spd) ? false : ( arma_config::optimise_sym && (auxlib::crippled_lapack(B) == false) && sym_helper::is_approx_sym(B, uword(100)) );
     
     const bool status = (strip_inv<T2>::do_inv_spd) ? auxlib::solve_sympd_fast(solve_result, B, C) : ( (is_sym) ? auxlib::solve_sym_fast(solve_result, B, C) : auxlib::solve_square_fast(solve_result, B, C) );
     
diff --git a/include/armadillo_bits/op_inv_gen_meat.hpp b/include/armadillo_bits/op_inv_gen_meat.hpp
index 12439f67..5dc27c5d 100644
--- a/include/armadillo_bits/op_inv_gen_meat.hpp
+++ b/include/armadillo_bits/op_inv_gen_meat.hpp
@@ -221,7 +221,7 @@ op_inv_gen_full::apply_direct(Mat<typename T1::elem_type>& out, const Base<typen
     return auxlib::inv_tr(out, ((is_triu_expr || is_triu_mat) ? uword(0) : uword(1)));
     }
   
-  if( (arma_config::optimise_sym) && (auxlib::crippled_lapack(out) == false) && (sym_helper::is_approx_sym(out)) )
+  if( (arma_config::optimise_sym) && (auxlib::crippled_lapack(out) == false) && (sym_helper::is_approx_sym(out, uword(100))) )
     {
     arma_debug_print("op_inv_gen_full: symmetric/hermitian optimisation");
     
@@ -387,7 +387,7 @@ op_inv_gen_rcond::apply_direct(Mat<typename T1::elem_type>& out, op_inv_gen_stat
     return auxlib::inv_tr_rcond(out, out_state.rcond, ((is_triu_expr || is_triu_mat) ? uword(0) : uword(1)));
     }
   
-  if( (arma_config::optimise_sym) && (auxlib::crippled_lapack(out) == false) && (sym_helper::is_approx_sym(out)) )
+  if( (arma_config::optimise_sym) && (auxlib::crippled_lapack(out) == false) && (sym_helper::is_approx_sym(out, uword(100))) )
     {
     arma_debug_print("op_inv_gen_rcond: symmetric/hermitian optimisation");
     
diff --git a/include/armadillo_bits/op_rcond_meat.hpp b/include/armadillo_bits/op_rcond_meat.hpp
index c28360ad..fc3b2398 100644
--- a/include/armadillo_bits/op_rcond_meat.hpp
+++ b/include/armadillo_bits/op_rcond_meat.hpp
@@ -89,7 +89,7 @@ op_rcond::apply(const Base<typename T1::elem_type, T1>& X)
     return auxlib::rcond_trimat(A, layout);
     }
   
-  if( (arma_config::optimise_sym) && (auxlib::crippled_lapack(A) == false) && (sym_helper::is_approx_sym(A)) )
+  if( (arma_config::optimise_sym) && (auxlib::crippled_lapack(A) == false) && (sym_helper::is_approx_sym(A, uword(100))) )
     {
     arma_debug_print("op_rcond::apply(): symmetric/hermitian optimisation");