diff --git a/.gitlab/templates/setup-workspace.yml b/.gitlab/templates/setup-workspace.yml
index a537aab4712f6138225e1e05d46068404a1458af..ee3ae2c38d191bee7b99a525ed7791abf24edf1a 100644
--- a/.gitlab/templates/setup-workspace.yml
+++ b/.gitlab/templates/setup-workspace.yml
@@ -24,8 +24,8 @@
       git checkout FETCH_HEAD
       git submodule update --init --recursive --depth 1
 
-      git fetch origin main
-      CI_MERGE_REQUEST_DIFF_BASE_SHA=$(git merge-base FETCH_HEAD origin/main)
+      git fetch $PUBLIC_REPO_URL main:refs/remotes/public/main
+      CI_MERGE_REQUEST_DIFF_BASE_SHA=$(git merge-base FETCH_HEAD public/main)
 
       # Save ENV variables
       mkdir -p .env