diff --git a/.github/workflows/helm-loki-ci.yml b/.github/workflows/helm-loki-ci.yml
index 7a28505791184..bfc26ac94171b 100644
--- a/.github/workflows/helm-loki-ci.yml
+++ b/.github/workflows/helm-loki-ci.yml
@@ -5,6 +5,9 @@ on:
     paths:
       - "production/helm/loki/**"
 
+permissions:
+  pull-requests: write
+
 jobs:
   publish-diff:
     # temporarily disable the workflow for the PRs where PRs branch is from fork.
diff --git a/production/helm/loki/scenarios/simple-scalable-aws-kube-irsa-values.yaml b/production/helm/loki/scenarios/simple-scalable-aws-kube-irsa-values.yaml
index 28c6c3bbe9162..2f2cbbb6eae32 100644
--- a/production/helm/loki/scenarios/simple-scalable-aws-kube-irsa-values.yaml
+++ b/production/helm/loki/scenarios/simple-scalable-aws-kube-irsa-values.yaml
@@ -16,7 +16,7 @@ loki:
       - from: "2023-09-19"
         index:
           period: 1d
-          prefix: tsdb_index_
+          prefix: tsdbf_index_
         object_store: s3
         schema: v13
         store: tsdb