diff --git a/test/test_api_h.py b/test/test_api_h.py
index 5ed2d121..205793f2 100644
--- a/test/test_api_h.py
+++ b/test/test_api_h.py
@@ -8,7 +8,7 @@ import pqclean
 def test_preprocessor():
     for scheme in pqclean.Scheme.all_schemes():
         for implementation in scheme.implementations:
-            if helpers.permit_test('preprocessor', implementation): 
+            if helpers.permit_test('preprocessor', implementation):
                 yield check_preprocessor, implementation
 
 
diff --git a/test/test_char.py b/test/test_char.py
index 48aa55c9..3f8f7296 100644
--- a/test/test_char.py
+++ b/test/test_char.py
@@ -17,7 +17,7 @@ def test_char():
         )
     for scheme in pqclean.Scheme.all_schemes():
         for implementation in scheme.implementations:
-            if helpers.permit_test('char', implementation): 
+            if helpers.permit_test('char', implementation):
                 yield check_char, implementation
 
 
diff --git a/test/test_compile_lib.py b/test/test_compile_lib.py
index e4b1ae5c..c3888543 100644
--- a/test/test_compile_lib.py
+++ b/test/test_compile_lib.py
@@ -10,7 +10,7 @@ import helpers
 def test_compile_lib():
     for scheme in pqclean.Scheme.all_schemes():
         for implementation in scheme.implementations:
-            if helpers.permit_test('compile_lib', implementation): 
+            if helpers.permit_test('compile_lib', implementation):
                 yield check_compile_lib, implementation