diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4ddef665b6d..ca03e5082be 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -168,6 +168,7 @@ jobs:
       - uses: EmbarkStudios/cargo-deny-action@v1
         with:
           command: check ${{ matrix.checks }}
+
   wasm:
     name: WebAssembly
     runs-on: ubuntu-latest
@@ -188,3 +189,34 @@ jobs:
         name: crates with 'wasm' feature
       - run: cd gix-pack && cargo build --all-features --target ${{ matrix.target }}
         name: gix-pack with all features (including wasm)
+
+  check-packetline:
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    continue-on-error: true
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+      - uses: extractions/setup-just@v2
+      - name: Check that working tree is initially clean
+        run: |
+          set -x
+          git status
+          git status | tee | grep -qF 'nothing to commit, working tree clean'
+      - name: Regenerate gix-packetline-blocking/src
+        run: just copy-packetline
+      - name: Check that gix-packetline-blocking/src was already up to date
+        run: |
+          set -x
+          git status
+          git status | tee | grep -qF 'nothing to commit, working tree clean'