diff --git a/hierarc/Likelihood/hierarchy_likelihood.py b/hierarc/Likelihood/hierarchy_likelihood.py
index 2b09555..a996350 100644
--- a/hierarc/Likelihood/hierarchy_likelihood.py
+++ b/hierarc/Likelihood/hierarchy_likelihood.py
@@ -283,9 +283,13 @@ def log_likelihood_single(
 
         if self._gamma_in_prior is not None and self._gamma_in_error is not None:
             if self._gamma_in_array is not None and self._log_m2l_array is not None:
-                lnlikelihood -= (self._gamma_in_prior - scaling_param_array[-2])**2 / (2 * self._gamma_in_error**2)
+                lnlikelihood -= (
+                    self._gamma_in_prior - scaling_param_array[-2]
+                ) ** 2 / (2 * self._gamma_in_error**2)
             elif self._gamma_in_array is not None and self._log_m2l_array is None:
-                lnlikelihood -= (self._gamma_in_prior - scaling_param_array[-1])**2 / (2 * self._gamma_in_error**2)
+                lnlikelihood -= (
+                    self._gamma_in_prior - scaling_param_array[-1]
+                ) ** 2 / (2 * self._gamma_in_error**2)
 
         return np.nan_to_num(lnlikelihood)