diff --git a/_data/rules.yml b/_data/rules.yml
index 838591e..109b0c8 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -821,7 +821,7 @@ groups:
                   The exporter must be started with --include-system-metrics flag or REDIS_EXPORTER_INCL_SYSTEM_METRICS=true environment variable.
               - name: Redis out of configured maxmemory
                 description: Redis is running out of configured maxmemory (> 90%)
-                query: "redis_memory_used_bytes / redis_memory_max_bytes * 100 > 90"
+                query: "redis_memory_used_bytes / redis_memory_max_bytes * 100 > 90 and on(instance) redis_memory_max_bytes > 0"
                 severity: warning
                 for: 2m
               - name: Redis too many connections