diff --git a/etc/prometheus_config/prometheus.yaml b/etc/prometheus_config/prometheus.yaml
index 7869f9fe0113435313552fe05a84a570954deb7f..7579db1412524d12cfc8491bc94f8e9ae3bebd1e 100644
--- a/etc/prometheus_config/prometheus.yaml
+++ b/etc/prometheus_config/prometheus.yaml
@@ -3,7 +3,7 @@ global:
   evaluation_interval: 10s
 
 rule_files:
-  - "rules/*rules.yml"
+  - "rules/*rules.yaml"
 
 scrape_configs:
   - job_name: prometheus
diff --git a/etc/prometheus_config/rules/ob_rules.yaml b/etc/prometheus_config/rules/ob_rules.yaml
index 94abf1dd03c707f849a01702240b9b8d9e5da597..eb9ad3248202b16ca186f4be15c5a0ce4ef33659 100644
--- a/etc/prometheus_config/rules/ob_rules.yaml
+++ b/etc/prometheus_config/rules/ob_rules.yaml
@@ -38,7 +38,7 @@ groups:
         description: "{{ $labels.ob_cluster_name }} {{ $labels.ob_cluster_id }} error index table count is {{ $value }}"
 
     - alert: ob_cluster_merge_timeout
-      expr: max(ob_zone_stat{name="is_merge_timeout"}) by (ob_cluster_name, ob_cluster_id) = 1
+      expr: max(ob_zone_stat{name="is_merge_timeout"}) by (ob_cluster_name, ob_cluster_id) == 1
       for: 1m
       labels:
         serverity: page
@@ -47,7 +47,7 @@ groups:
         description: "{{ $labels.ob_cluster_name }} {{ $labels.ob_cluster_id }} merge time out"
 
     - alert: ob_cluster_merge_error
-      expr: max(ob_zone_stat{name="is_merge_error"}) by (ob_cluster_name, ob_cluster_id) = 1
+      expr: max(ob_zone_stat{name="is_merge_error"}) by (ob_cluster_name, ob_cluster_id) == 1
       for: 1m
       labels:
         serverity: page