diff --git a/host_vars/boeing.adm.crans.org b/host_vars/boeing.adm.crans.org.yml
similarity index 96%
rename from host_vars/boeing.adm.crans.org
rename to host_vars/boeing.adm.crans.org.yml
index 33b8f80c..1f2c6005 100644
--- a/host_vars/boeing.adm.crans.org
+++ b/host_vars/boeing.adm.crans.org.yml
@@ -1,3 +1,4 @@
+---
 postfix:
   primary: false
   secondary: true
diff --git a/host_vars/redisdead.adm.crans.org.yml b/host_vars/redisdead.adm.crans.org.yml
index 5d7def8e..d42f5d22 100644
--- a/host_vars/redisdead.adm.crans.org.yml
+++ b/host_vars/redisdead.adm.crans.org.yml
@@ -1,3 +1,4 @@
+---
 postfix:
   primary: true
   secondary: false
diff --git a/host_vars/sputnik.adm.crans.org.yml b/host_vars/sputnik.adm.crans.org.yml
index c077ff2a..22d6f2e7 100644
--- a/host_vars/sputnik.adm.crans.org.yml
+++ b/host_vars/sputnik.adm.crans.org.yml
@@ -1,3 +1,4 @@
+---
 postfix:
   primary: false
   secondary: true
diff --git a/host_vars/titanic.adm.crans.org b/host_vars/titanic.adm.crans.org.yml
similarity index 96%
rename from host_vars/titanic.adm.crans.org
rename to host_vars/titanic.adm.crans.org.yml
index 33b8f80c..1f2c6005 100644
--- a/host_vars/titanic.adm.crans.org
+++ b/host_vars/titanic.adm.crans.org.yml
@@ -1,3 +1,4 @@
+---
 postfix:
   primary: false
   secondary: true