diff --git a/stardis/radiation_field/opacities/opacities_solvers/base.py b/stardis/radiation_field/opacities/opacities_solvers/base.py
index a0442b94..61e64e3d 100644
--- a/stardis/radiation_field/opacities/opacities_solvers/base.py
+++ b/stardis/radiation_field/opacities/opacities_solvers/base.py
@@ -835,9 +835,9 @@ def calc_alphas(
         opacity_config.line,
         n_threads,
     )
-    stellar_radiation_field.opacities.opacities_dict["alpha_line_at_nu"] = (
-        alpha_line_at_nu
-    )
+    stellar_radiation_field.opacities.opacities_dict[
+        "alpha_line_at_nu"
+    ] = alpha_line_at_nu
     stellar_radiation_field.opacities.opacities_dict["alpha_line_at_nu_gammas"] = gammas
     stellar_radiation_field.opacities.opacities_dict[
         "alpha_line_at_nu_doppler_widths"