diff --git a/pyesgf/search/connection.py b/pyesgf/search/connection.py
index 5fa420e..6c76cd4 100644
--- a/pyesgf/search/connection.py
+++ b/pyesgf/search/connection.py
@@ -368,7 +368,7 @@ def create_single_session(cache=None, expire_after=datetime.timedelta(hours=1),
             # Corrupted cache:
             try:
                 os.remove(cache)
-            except Exception as exc:
+            except Exception:
                 pass
             session = (requests_cache.core
                        .CachedSession(cache, expire_after=expire_after))
diff --git a/setup.py b/setup.py
index 1ee70c4..966e591 100644
--- a/setup.py
+++ b/setup.py
@@ -39,7 +39,8 @@
       include_package_data=True,
       zip_safe=False,
       install_requires=['jinja2', 'requests', 'requests_cache', 'six'],
-      extras_require={'testing': ['myproxyclient', 'pytest', 'nose']},
-      tests_require=['pytest'],
+      extras_require={'testing':
+                      ['myproxyclient', 'pytest', 'nose', 'flake8']},
+      tests_require=['pytest', 'flake8'],
       entry_points={},
       test_suite='test')