diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index 0104b4f..ad0bbf2 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -73,7 +73,7 @@ jobs:
         id: prep
         run: |
           env | sort
-          VERSION="sha-${GITHUB_SHA:0:8}"
+          VERSION=sha-${GITHUB_SHA::8}
           echo $VERSION
 
       - name: Docker meta