diff --git a/csv_metadata_quality/check.py b/csv_metadata_quality/check.py
index 0527153..82e771e 100755
--- a/csv_metadata_quality/check.py
+++ b/csv_metadata_quality/check.py
@@ -1,5 +1,6 @@
 import pandas as pd
 
+
 def issn(field):
     """Check if an ISSN is valid.
 
@@ -71,7 +72,6 @@ def separators(field):
         if len(match) > 0:
             print(f'Invalid multi-value separator: {field}')
 
-
     return field
 
 
diff --git a/csv_metadata_quality/fix.py b/csv_metadata_quality/fix.py
index 9a6fcc8..8144f4e 100755
--- a/csv_metadata_quality/fix.py
+++ b/csv_metadata_quality/fix.py
@@ -1,6 +1,7 @@
 import pandas as pd
 import re
 
+
 def whitespace(field):
     """Fix whitespace issues.
 
@@ -34,4 +35,3 @@ def whitespace(field):
     new_field = '||'.join(values)
 
     return new_field
-
diff --git a/tests/test_check.py b/tests/test_check.py
index 7f0cdf3..dad28d0 100644
--- a/tests/test_check.py
+++ b/tests/test_check.py
@@ -1,12 +1,13 @@
 import csv_metadata_quality.check as check
 
+
 def test_check_invalid_issn(capsys):
     '''Test checking invalid ISSN.'''
 
     value = '2321-2302'
 
     check.issn(value)
-    
+
     captured = capsys.readouterr()
     assert captured.out == f'Invalid ISSN: {value}\n'
 
diff --git a/tests/test_fix.py b/tests/test_fix.py
index d3a0c8b..1241819 100644
--- a/tests/test_fix.py
+++ b/tests/test_fix.py
@@ -1,5 +1,6 @@
 import csv_metadata_quality.fix as fix
 
+
 def test_fix_leading_whitespace():
     '''Test fixing leading whitespace.'''
 
@@ -7,6 +8,7 @@ def test_fix_leading_whitespace():
 
     assert fix.whitespace(value) == 'Alan'
 
+
 def test_fix_trailing_whitespace():
     '''Test fixing trailing whitespace.'''
 
@@ -14,6 +16,7 @@ def test_fix_trailing_whitespace():
 
     assert fix.whitespace(value) == 'Alan'
 
+
 def test_fix_excessive_whitespace():
     '''Test fixing excessive whitespace.'''