diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index f844758..435093d 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -14,7 +14,7 @@ jobs:
 
       - name: Generate code coverage
         run: |
-          cargo tarpaulin --verbose --features lua53,vendored,async,send,serialize,macros --out xml --exclude-files benches --exclude-files tests --exclude-files build --exclude-files src/ffi
+          cargo tarpaulin --verbose --features lua53,vendored,async,send,serialize,macros --out xml --exclude-files benches --exclude-files build --exclude-files mlua_derive --exclude-files src/ffi --exclude-files tests
 
       - name: Upload to codecov.io
         uses: codecov/codecov-action@v1