diff --git a/.flake8 b/.flake8
index 24729b2..5f13706 100644
--- a/.flake8
+++ b/.flake8
@@ -16,7 +16,7 @@ statistics = True
 count = True
 per-file-ignores =
     __init__.py:F401,F403,D100
-    tests/*:F403,W503,F841,E501,E261,E241,E231,E124,E201,E126,E127,E128,D100,D403,D205,D101
+    tests/*:F403,W503,F841,E501,E261,E241,E231,E124,E201,E126,E127,E128,D100,D403,D205,D101,D104
     docs/*:D100
 max-line-length = 120
 docstring-convention = numpy
diff --git a/tests/python_tests/backends/__init__.py b/tests/python_tests/backends/__init__.py
new file mode 100644
index 0000000..2ae2839
--- /dev/null
+++ b/tests/python_tests/backends/__init__.py
@@ -0,0 +1 @@
+pass