diff --git a/prometheus/files/alerts.yml b/prometheus/files/alerts.yml
index 97d0dde..75b3ad3 100644
--- a/prometheus/files/alerts.yml
+++ b/prometheus/files/alerts.yml
@@ -31,7 +31,7 @@
   {%- if alert.get('enabled', True) %}
     ALERT {{ alertname }}
       IF {{ alert.if }}
-      {%- if alert.for is defined %}FOR {{ alert.for }}{%- endif %}
+      {% if alert.for is defined %}FOR {{ alert.for }}{% endif %}
       {%- if alert.labels is defined %}
       LABELS {
         {%- for name, value in alert.labels.iteritems() %}