diff --git a/bilby/core/sampler/cpnest.py b/bilby/core/sampler/cpnest.py
index 070241076896a2ec0b5635d137b60678987611f8..fe46149f983cfa5f4ad2ac7aa8685558d3d27fe6 100644
--- a/bilby/core/sampler/cpnest.py
+++ b/bilby/core/sampler/cpnest.py
@@ -13,7 +13,6 @@ except ImportError:
                    'not be able to use the CPNest sampler')
 
 
-
 class Cpnest(NestedSampler):
     """ bilby wrapper of cpnest (https://github.com/johnveitch/cpnest)
 
diff --git a/bilby/core/sampler/pymultinest.py b/bilby/core/sampler/pymultinest.py
index 9cd7636a6c8164e66c2881713275ee0a3b66a369..5a4888ae4a2e473b28e996c5f0542f1e0d409432 100644
--- a/bilby/core/sampler/pymultinest.py
+++ b/bilby/core/sampler/pymultinest.py
@@ -72,7 +72,7 @@ class Pymultinest(NestedSampler):
                 'The length of {} exceeds 78 characters. '
                 ' Post-processing will fail because the file names will be cut'
                 ' off. Please choose a shorter "outdir" or "label".'
-                    .format(self.__kwargs['outputfiles_basename']))
+                .format(self.__kwargs['outputfiles_basename']))
         check_directory_exists_and_if_not_mkdir(
             self.kwargs['outputfiles_basename'])
         NestedSampler._verify_kwargs_against_default_kwargs(self)