diff --git a/tox.ini b/tox.ini
index dc3faea5f..b77ac4525 100644
--- a/tox.ini
+++ b/tox.ini
@@ -62,8 +62,8 @@ deps =
     flake8-rst-docstrings
     git+https://github.com/amazon-braket/amazon-braket-build-tools.git
 commands =
-    flake8 {posargs}
-    flake8 --enable-extensions=BCS src
+    flake8 --extend-exclude src {posargs}
+    flake8 --enable-extensions=BCS src {posargs}
 
 [testenv:isort]
 basepython = python3