diff --git a/.github/workflows/deps.yml b/.github/workflows/deps.yml
index ac770335a4e0..e88cde7de48c 100644
--- a/.github/workflows/deps.yml
+++ b/.github/workflows/deps.yml
@@ -30,12 +30,18 @@ jobs:
       # Run the commands to generate dependencies before and after and compare.
       - name: Compare dependencies
         run: |
-          BEFORE="$(mktemp -d)"
-          AFTER="$(mktemp -d)"
+          set -eux
+          BASE_REF="${GITHUB_BASE_REF:-master}"
+          # Suffixes passed to mktemp must not contain "/".
+          BEFORE_SUFFIX="${BASE_REF//\//_}"
+          AFTER_SUFFIX="${GITHUB_REF_NAME//\//_}"
+
+          BEFORE="$(mktemp -d --suffix="-${BEFORE_SUFFIX}")"
+          AFTER="$(mktemp -d --suffix="-${AFTER_SUFFIX}")"
 
           scripts/gen-deps.sh "${AFTER}"
           # GITHUB_BASE_REF is set when the job is triggered by a PR.
-          git checkout origin/"${GITHUB_BASE_REF:-master}"
+          git checkout origin/"${BASE_REF}"
           scripts/gen-deps.sh "${BEFORE}"
 
           echo "Comparing dependencies..."