diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a271d0de6..a851ea904 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,6 +21,9 @@ jobs:
     steps:
       - name: Checkout tree
         uses: actions/checkout@v4
+        with:
+          # We need to fetch the history so we can compare against master
+          fetch-depth: 0
 
       - name: Install GNU prallel
         run: sudo apt-get install -y parallel
@@ -36,4 +39,4 @@ jobs:
       # Get the names of the packages being added to the archive, and feed these
       # to opam-ci-check
       - name: Lint newly archived packages
-        run: git diff --name-only main | sed 's:.*/\(.*\)/opam:\1:' | parallel opam exec -- opam-ci-check lint -r . --checks=archive-repo
+        run: git diff --name-only origin/main | sed 's:.*/\(.*\)/opam:\1:' | parallel opam exec -- opam-ci-check lint -r . --checks=archive-repo