diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..b525c01
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, pypy2, pypy3]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install Tox and any other packages
+      run: pip install tox
+    - name: Lint
+      if: matrix.python-version == '2.7' || matrix.python-version == '3.7'
+      run: |
+        pip install flake8
+        flake8 git_stacktrace
+    - name: Run Tests via Tox
+      # Run tox using the version of Python in `PATH`
+      run: tox -e py
diff --git a/git_stacktrace/parse_trace.py b/git_stacktrace/parse_trace.py
index 85634ac..0068d70 100644
--- a/git_stacktrace/parse_trace.py
+++ b/git_stacktrace/parse_trace.py
@@ -129,7 +129,7 @@ def extract_traceback(self, lines):
         self.lines = extracted
         # Sanity check
         new_lines = traceback.format_list(self.traceback_format())
-        new_lines = ('\n'.join([l.rstrip() for l in new_lines]))
+        new_lines = ('\n'.join([line.rstrip() for line in new_lines]))
         lines = ('\n'.join(lines))
         if lines != new_lines or not self.lines:
             message = "Incorrectly extracted traceback information"