diff --git a/rules/redis.yml b/rules/redis.yml
index 6de2d5c..2dca8ca 100644
--- a/rules/redis.yml
+++ b/rules/redis.yml
@@ -48,7 +48,7 @@ groups:
           description: "Redis has not been backuped for 24 hours\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
 
       - alert: RedisOutOfSystemMemory
-        expr: redis_memory_used_bytes / redis_total_system_memory_bytes * 100 > 90
+        expr: redis_memory_used_bytes / redis_total_system_memory_bytes * 100 > 90 and on(instance) redis_memory_max_bytes > 0
         for: 5m
         labels:
           severity: page