diff --git a/mypy_primer/type_checker.py b/mypy_primer/type_checker.py
index 503c633..9e53de9 100644
--- a/mypy_primer/type_checker.py
+++ b/mypy_primer/type_checker.py
@@ -64,7 +64,9 @@ async def pip_install(*targets: str) -> None:
         # pth file that lets us let mypy import plugins from another venv
         # importantly, this puts the plugin paths at the back of sys.path, so they cannot
         # clobber mypy or its dependencies
-        f.write(r"""import os; import sys; exec('''env = os.environ.get("MYPY_PRIMER_PLUGIN_SITE_PACKAGES")\nif env: sys.path.extend(env.split(os.pathsep))''')""")
+        f.write(
+            r"""import os; import sys; exec('''env = os.environ.get("MYPY_PRIMER_PLUGIN_SITE_PACKAGES")\nif env: sys.path.extend(env.split(os.pathsep))''')"""
+        )
 
     mypy_exe = venv.script("mypy")
     if sys.platform == "darwin":
diff --git a/test.sh b/test.sh
index 12322a9..3d385dd 100755
--- a/test.sh
+++ b/test.sh
@@ -2,7 +2,7 @@ set -ex
 
 isort --diff --check --quiet .
 black --diff --check --quiet .
-flake8 --max-line-length=100 --ignore=E203,W503 $(git ls-files | grep "py$")
+flake8 --max-line-length=100 --ignore=E203,E501,W503 $(git ls-files | grep "py$")
 mypy -p mypy_primer --strict --python-version 3.10
 # check we have unique projects
 python -c 'from mypy_primer.projects import get_projects; get_projects()'