diff --git a/contrib/mixin/mixin.libsonnet b/contrib/mixin/mixin.libsonnet
index 83283f7d5..0313d0328 100644
--- a/contrib/mixin/mixin.libsonnet
+++ b/contrib/mixin/mixin.libsonnet
@@ -213,7 +213,7 @@
           {
             alert: 'etcdBackendQuotaLowSpace',
             expr: |||
-              (etcd_mvcc_db_total_size_in_bytes/etcd_server_quota_backend_bytes)*100 > 95
+              (last_over_time(etcd_mvcc_db_total_size_in_bytes[5m]) / last_over_time(etcd_server_quota_backend_bytes[5m]))*100 > 95
             ||| % $._config,
             'for': '10m',
             labels: {