diff --git a/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json b/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
index 7e650f6e2d6708adec1d0cf0423a89cf6d4daa49..eee6ffd1d549734ebd35f4410e73f96bcd768582 100644
--- a/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
+++ b/nixos/modules/monitoring/server/grafana-dashboards/resources-overview.json
@@ -1149,7 +1149,7 @@
       "pluginVersion": "8.4.5",
       "targets": [
         {
-          "expr": "1 - (node_filesystem_avail_bytes / node_filesystem_size_bytes) > 0.1",
+          "expr": "1 - (node_filesystem_avail_bytes{mountpoint!='/nix/store'} / node_filesystem_size_bytes{mountpoint!='/nix/store'}) > 0.1",
           "format": "time_series",
           "hide": false,
           "instant": false,