diff --git a/control/statesp.py b/control/statesp.py
index 6b3a1dff3..ffd579247 100644
--- a/control/statesp.py
+++ b/control/statesp.py
@@ -921,6 +921,10 @@ def horner(self, x, warn_infinite=True):
                         out[:, :, idx] = complex(np.nan, np.nan)
                     else:
                         out[:, :, idx] = complex(np.inf, np.nan)
+                else:
+                    if np.any(np.isnan(out[:, :, idx])):
+                        print(idx, x_idx, self.A, self.B)
+                        print(out[:, :, idx])
 
         return out
 
diff --git a/control/tests/flatsys_test.py b/control/tests/flatsys_test.py
index 373af8dae..6f4ef7cef 100644
--- a/control/tests/flatsys_test.py
+++ b/control/tests/flatsys_test.py
@@ -339,8 +339,9 @@ def test_point_to_point_errors(self):
         traj_kwarg = fs.point_to_point(
             flat_sys, timepts, x0, u0, xf, uf, cost=cost_fcn,
             basis=fs.PolyFamily(8), minimize_kwargs={'method': 'slsqp'})
-        np.testing.assert_almost_equal(
-            traj_method.eval(timepts)[0], traj_kwarg.eval(timepts)[0])
+        np.testing.assert_allclose(
+            traj_method.eval(timepts)[0], traj_kwarg.eval(timepts)[0],
+            atol=1e-5)
 
         # Unrecognized keywords
         with pytest.raises(TypeError, match="unrecognized keyword"):
diff --git a/control/tests/timeresp_test.py b/control/tests/timeresp_test.py
index c74c0c06d..d9cb065f6 100644
--- a/control/tests/timeresp_test.py
+++ b/control/tests/timeresp_test.py
@@ -681,7 +681,8 @@ def test_forced_response_T_U(self, tsystem, fr_kwargs, refattr):
             fr_kwargs['X0'] = tsystem.X0
         t, y = forced_response(tsystem.sys, **fr_kwargs)
         np.testing.assert_allclose(t, tsystem.t)
-        np.testing.assert_allclose(y, getattr(tsystem, refattr), rtol=1e-3)
+        np.testing.assert_allclose(y, getattr(tsystem, refattr),
+                                   rtol=1e-3, atol=1e-5)
 
     @pytest.mark.parametrize("tsystem", ["siso_ss1"], indirect=True)
     def test_forced_response_invalid_c(self, tsystem):