diff --git a/deploy/charts/deployment-tracker/templates/deployment.yaml b/deploy/charts/deployment-tracker/templates/deployment.yaml
index 4ce5c9f..800656b 100644
--- a/deploy/charts/deployment-tracker/templates/deployment.yaml
+++ b/deploy/charts/deployment-tracker/templates/deployment.yaml
@@ -1,3 +1,6 @@
+{{- if and .Values.config.namespace .Values.config.excludeNamespaces }}
+{{- fail "config.namespace and config.excludeNamespaces are mutually exclusive and cannot both be set" }}
+{{- end }}
 apiVersion: apps/v1
 kind: Deployment
 metadata: