diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2143d391061..db819ccc4ad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -225,8 +225,8 @@ jobs:
     if: github.ref != 'refs/heads/master'
     steps:
       # See https://github.com/actions/checkout/issues/552#issuecomment-1167086216
-      - name: "PR commits + 1"
-        run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> "${GITHUB_ENV}"
+      - name: "PR commits"
+        run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} ))" >> "${GITHUB_ENV}"
 
       - name: "Checkout PR branch and all PR commits"
         uses: actions/checkout@v4
@@ -235,10 +235,6 @@ jobs:
           ref: ${{ github.event.pull_request.head.ref }}
           fetch-depth: ${{ env.PR_FETCH_DEPTH }}
 
-      - name: "Fetch the other branch with enough history for a common merge-base commit"
-        run: |
-          git fetch origin ${{ github.event.pull_request.base.ref }}
-
       - name: Check for fixups
         run: |
           ./scripts/check_for_fixups.sh ${{ github.event.pull_request.base.ref }}
diff --git a/scripts/check_for_fixups.sh b/scripts/check_for_fixups.sh
index 31ed8640e31..3d5518360f3 100755
--- a/scripts/check_for_fixups.sh
+++ b/scripts/check_for_fixups.sh
@@ -1,19 +1,8 @@
 #!/bin/sh
 
-base_ref=$1
-
-# Determine the base commit
-base_commit=$(git merge-base HEAD origin/"$base_ref")
-
-# Check if base_commit is set correctly
-if [ -z "$base_commit" ]; then
-    echo "Failed to determine base commit."
-    exit 1
-fi
-echo "Base commit: $base_commit"
-
-# Get commits with "fixup!" in the message from base_commit to HEAD
-commits=$(git log -i -E --grep '^fixup!' --grep '^squash!' --grep '^amend!' --grep '^[^\n]*WIP' --grep '^[^\n]*DROPME' --format="%h %s" "$base_commit..HEAD")
+# We will have only done a shallow clone, so the git log will consist only of
+# commits on the current PR
+commits=$(git log --grep='^fixup!' --grep='^squash!' --grep='^amend!' --grep='^[^\n]*WIP' --grep='^[^\n]*DROPME' --format="%h %s")
 
 if [ -z "$commits" ]; then
     echo "No fixup commits found."