diff --git a/setup.py b/setup.py
index 92588ef7d..648824573 100644
--- a/setup.py
+++ b/setup.py
@@ -136,6 +136,7 @@ def detect_libb2(prefixes):
                 if 'blake2b_init' in fd.read():
                     return prefix
 
+
 include_dirs = []
 library_dirs = []
 define_macros = []
diff --git a/src/borg/helpers.py b/src/borg/helpers.py
index ab2e1271a..0898a4542 100644
--- a/src/borg/helpers.py
+++ b/src/borg/helpers.py
@@ -672,6 +672,7 @@ def replace_placeholders(text):
     }
     return format_line(text, data)
 
+
 PrefixSpec = replace_placeholders
 
 
@@ -1669,6 +1670,7 @@ def scandir_generic(path='.'):
     for name in sorted(os.listdir(path)):
         yield GenericDirEntry(path, name)
 
+
 try:
     from os import scandir
 except ImportError:
diff --git a/src/borg/platform/base.py b/src/borg/platform/base.py
index 496a59b50..d024ce76b 100644
--- a/src/borg/platform/base.py
+++ b/src/borg/platform/base.py
@@ -34,6 +34,7 @@ def acl_set(path, item, numeric_owner=False):
     of the user/group names
     """
 
+
 try:
     from os import lchflags
 
diff --git a/tox.ini b/tox.ini
index bcd560c59..5aa14a50d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,4 +16,4 @@ passenv = *
 [testenv:flake8]
 changedir =
 deps = flake8
-commands = flake8
+commands = flake8 src scripts conftest.py