diff --git a/.github/workflows/downgrade_versions.yml b/.github/workflows/downgrade_versions.yml
index 596824e4e9c1b..dee4c0ae5d7e4 100644
--- a/.github/workflows/downgrade_versions.yml
+++ b/.github/workflows/downgrade_versions.yml
@@ -46,7 +46,7 @@ jobs:
           # without annotation. This breaks check-downgrade-versions.sh
           # script as it is triggered only on annotated tags. Let's
           # checkout by sha in this case.
-          ref: github.sha
+          ref: ${{ github.sha }}
 
       - name: Fix "dubious ownership" issue
         run: git config --global --add safe.directory /__w/tarantool/tarantool