diff --git a/tutorials-v5/time-evolution/013_nonmarkovian_monte_carlo.md b/tutorials-v5/time-evolution/013_nonmarkovian_monte_carlo.md
index a05f6cb0..cca9f368 100644
--- a/tutorials-v5/time-evolution/013_nonmarkovian_monte_carlo.md
+++ b/tutorials-v5/time-evolution/013_nonmarkovian_monte_carlo.md
@@ -285,7 +285,7 @@ For clarity, we consider the same example as before, but with a shorter time int
 
 ```python
 times_is = np.linspace(ti, ti + duration / 2, steps + 1)
-ntraj_is = ntraj / 10
+ntraj_is = ntraj // 10
 
 MCSol_is = solver.run(psi0, tlist=times_is, ntraj=ntraj_is, e_ops=e_ops)
 MESol_is = qt.mesolve([H, S], psi0, times_is, d_ops, e_ops, options=options)