diff --git a/.github/workflows/compile.yaml b/.github/workflows/compile.yaml
index 8e5d8e4..286f69f 100644
--- a/.github/workflows/compile.yaml
+++ b/.github/workflows/compile.yaml
@@ -20,8 +20,10 @@ jobs:
       uses: actions/cache@v3
       with:
         path: |
-          **/build
-          overview
+          **/build/*
+          !**/build/*.pdf
+          overview/*
+          !Overview/*.pdf
         key: ${{ runner.os }}-eidi-ss2022-slides-${{ github.run_id }}
         restore-keys: ${{ runner.os }}-eidi-ss2022-slides-
     - name: use make docker to do the magic