diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6478e0c..d2ca5b0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -31,3 +31,10 @@ jobs:
       - name: Test with tox
         run: |
           tox
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          flags: unittests
+          name: Python ${{ matrix.python }} on ${{ matrix.os }}
+          fail_ci_if_error: true
diff --git a/tox.ini b/tox.ini
index 716df64..027a718 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ passenv = INCLUDE LIB LIBPATH Platform VCTools* VSCMD_* WindowsSDK*
 commands_pre =
     poetry install
 commands =
-    poetry run pytest --cov-report=xml -sv tests
+    poetry run pytest --cov-report=xml --cov=src -sv tests
 
 [testenv:lint]
 commands =