diff --git a/.gitea/workflows/cron.yml b/.gitea/workflows/cron.yml
index 4bafe16..12a360d 100644
--- a/.gitea/workflows/cron.yml
+++ b/.gitea/workflows/cron.yml
@@ -13,8 +13,9 @@ jobs:
       - uses: actions/cache@v4
         env:
           prefix-key: v0-rust
+          hash-short: $( $${{ hashFiles('Cargo.lock') }} | cut -c 1-8 )
         with:
-          key: ${{ env.prefix-key }}-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('Cargo.lock')|head -c 8 }}
+          key: ${{ env.prefix-key }}-${{ runner.os }}-${{ runner.arch }}-${{ env.hash-short }}
           restore-keys: |
             ${{ env.prefix-key }}-${{ runner.os }}-${{ runner.arch }}-
             ${{ env.prefix-key }}-${{ runner.os }}-