diff --git a/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json b/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
index 3fe9d0a805448b075da3e9ba502d3a5c81e299cf..077c43a39dfb075429f574b5221e6caf8d419360 100644
--- a/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
+++ b/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
@@ -370,7 +370,7 @@
       "pluginVersion": "8.3.5",
       "targets": [
         {
-          "expr": "1 - (node_memory_MemFree_bytes + node_memory_Buffers_bytes + node_memory_Cached_bytes) / node_memory_MemTotal_bytes\r\n",
+          "expr": "1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes",
           "interval": "",
           "intervalFactor": 4,
           "legendFormat": "{{instance}}",