diff --git a/stardis/radiation_field/opacities/opacities_solvers/base.py b/stardis/radiation_field/opacities/opacities_solvers/base.py
index a4bd37e9..aff1ab07 100644
--- a/stardis/radiation_field/opacities/opacities_solvers/base.py
+++ b/stardis/radiation_field/opacities/opacities_solvers/base.py
@@ -484,7 +484,7 @@ def calc_molecular_alpha_line_at_nu(
     return alpha_line_at_nu, gammas, doppler_widths
 
 
-@numba.njit(parallel=True)
+@numba.njit(parallel=True, fastmath=True)
 def calc_alan_entries(
     no_of_depth_points,
     tracing_nus_values,