diff --git a/jsonnet/kube-prometheus/blackbox-exporter/blackbox-exporter.libsonnet b/jsonnet/kube-prometheus/blackbox-exporter/blackbox-exporter.libsonnet
index e8d6c25b..a9b2614a 100644
--- a/jsonnet/kube-prometheus/blackbox-exporter/blackbox-exporter.libsonnet
+++ b/jsonnet/kube-prometheus/blackbox-exporter/blackbox-exporter.libsonnet
@@ -194,6 +194,7 @@
           kind: 'ServiceMonitor',
           metadata: {
             name: 'blackbox-exporter',
+            namespace: $._config.namespace,
             labels: bb.assignLabels
           },
           spec: {