diff --git a/src/problem.rs b/src/problem.rs
index 5e2f628..7e9856e 100644
--- a/src/problem.rs
+++ b/src/problem.rs
@@ -71,7 +71,7 @@ where
                             let test_y = self.integrator.step(&self.ode, test_t).0;
                             (callback.event)(self.ode.t + test_t, test_y, &self.ode.params)
                         };
-                        let root = find_root_regula_falsi(0.0, step, &f, &mut 1e-12).unwrap();
+                        let root = find_root_regula_falsi(0.0, step, &f, &mut 1e-8).unwrap();
                         step = root;
                         (new_y, _, dense_option) = self.integrator.step(&self.ode, step);
                         (callback.effect)(&mut self.ode);