diff --git a/telegraf/files/output/prometheus_client.conf b/telegraf/files/output/prometheus_client.conf
index 6677bc2..b60f26a 100644
--- a/telegraf/files/output/prometheus_client.conf
+++ b/telegraf/files/output/prometheus_client.conf
@@ -1,4 +1,7 @@
 [[outputs.{{ name }}]]
 {%- if values is defined %}
 listen = "{{ values.bind.address }}:{{ values.bind.port }}"
+{%-   if values.expiration_interval is defined %}
+expiration_interval = "{{ values.expiration_interval }}"
+{%-   endif %}
 {%- endif %}