diff --git a/prometheus/prometheus.yml b/prometheus/prometheus.yml
index d6cec37..dd4783c 100644
--- a/prometheus/prometheus.yml
+++ b/prometheus/prometheus.yml
@@ -11,7 +11,7 @@ global:
 
 # Load and evaluate rules in this file every 'evaluation_interval' seconds.
 rule_files:
-  - 'alert.rules.yml'
+  - 'alert.rules'
   # - "first.rules"
   # - "second.rules"