diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7475f57..573f8b1 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -31,3 +31,8 @@ jobs:
       - uses: ./this-action/
         with:
           use-latex: ${{ matrix.use-latex }}
+      - name: Check for unwanted files
+        run: |
+          test ! -f output.log
+          test ! -f __DOC_CHECKER__.g
+          find doc \( -name '*.aux' -o -name '*.bbl' -o -name '*.blg' -o -name '*.brf' -o -name '*.idx' -o -name '*.ilg' -o -name '*.ind' -o -name '*.log' -o -name '*.out' -o -name '*.pnr' -o -name '*.toc' -o -name '*.tst' \) -exec test ! -f {} +
diff --git a/action.yml b/action.yml
index ce3bbaf..36caaf1 100644
--- a/action.yml
+++ b/action.yml
@@ -120,3 +120,10 @@ runs:
 
         EOF
         $GAP __DOC_CHECKER__.g -c "QUIT;"
+
+    - name: "Cleanup environment"
+      shell: bash
+      run: |
+        rm -f __DOC_CHECKER__.g
+        rm -f output.log
+        find doc \( -name '*.aux' -o -name '*.bbl' -o -name '*.blg' -o -name '*.brf' -o -name '*.idx' -o -name '*.ilg' -o -name '*.ind' -o -name '*.log' -o -name '*.out' -o -name '*.pnr' -o -name '*.toc' -o -name '*.tst' \) -exec rm -f {} +