diff --git a/etc/icinga2/conf.d/macros.conf b/etc/icinga2/conf.d/macros.conf
index 696b3a58d..630d77068 100644
--- a/etc/icinga2/conf.d/macros.conf
+++ b/etc/icinga2/conf.d/macros.conf
@@ -1,7 +1,7 @@
 /**
  * Global macros
  */
-var IcingaMacros = {
+const IcingaMacros = {
   plugindir = "/usr/lib/nagios/plugins"
 }