diff --git a/.gitea/workflows/sync-annotations.yml b/.gitea/workflows/sync-annotations.yml
index 7a8eab4..3106eba 100644
--- a/.gitea/workflows/sync-annotations.yml
+++ b/.gitea/workflows/sync-annotations.yml
@@ -32,3 +32,16 @@ jobs:
           mc cp --recursive --attr 'Content-Type=application/json' \
           myminio/visual-semiotic-ai-analysis/label-studio-output/ \
           myminio/visual-semiotic-ai-analysis/label-studio-output/
+
+      - name: Ensure .json extension on files
+        env:
+          MINIO_ACCESS_KEY: ${{ secrets.MINIO_ACCESS_KEY }}
+          MINIO_SECRET_KEY: ${{ secrets.MINIO_SECRET_KEY }}
+        run: |
+          mc alias set myminio http://10.0.0.2:9000 $MINIO_ACCESS_KEY $MINIO_SECRET_KEY
+          for file in $(mc ls --recursive myminio/visual-semiotic-ai-analysis/label-studio-output/ | awk '{print $NF}'); do
+            if [[ "$file" != *.json ]]; then
+              mc mv "myminio/visual-semiotic-ai-analysis/label-studio-output/$file" \
+                    "myminio/visual-semiotic-ai-analysis/label-studio-output/$file.json"
+            fi
+          done