diff --git a/jsonnet/kube-prometheus/components/node-exporter.libsonnet b/jsonnet/kube-prometheus/components/node-exporter.libsonnet
index d59d22e701d3385656d21667764c27539ad06c0d..2498cc8173e1155c89fd8abf384d7dbf0d09b78b 100644
--- a/jsonnet/kube-prometheus/components/node-exporter.libsonnet
+++ b/jsonnet/kube-prometheus/components/node-exporter.libsonnet
@@ -28,6 +28,7 @@ local defaults = {
     ruleLabels: {},
     _config: {
       nodeExporterSelector: 'job="' + defaults.name + '"',
+      fsSpaceFillingUpWarningThreshold: 20,
       fsSpaceFillingUpCriticalThreshold: 15,
       diskDeviceSelector: 'device=~"mmcblk.p.+|nvme.+|rbd.+|sd.+|vd.+|xvd.+|dm-.+|dasd.+"',
       runbookURLPattern: 'https://runbooks.prometheus-operator.dev/runbooks/node/%s',