diff --git a/group_vars/all b/group_vars/all
index 70384a32c..b5d2708bb 100644
--- a/group_vars/all
+++ b/group_vars/all
@@ -1,6 +1,9 @@
 ---
 # Variables here are applicable to all host groups NOT roles
 
+# Dummy variable to avoid error because ansible does not recognize the file as a good configuration file when no variable in it.
+dummy:
+
 ## Setup options
 #
 #ceph_release: firefly
diff --git a/group_vars/mons b/group_vars/mons
index bb1ae7285..e6408704b 100644
--- a/group_vars/mons
+++ b/group_vars/mons
@@ -1,5 +1,8 @@
 ---
 # Variables here are applicable to all host groups NOT roles
 
+# Dummy variable to avoid error because ansible does not recognize the file as a good configuration file when no variable in it.
+dummy:
+
 # Monitor options
 #monitor_secret: # /!\ GENERATE ONE WITH 'ceph-authtool --gen-print-key' /!\
diff --git a/group_vars/osds b/group_vars/osds
index 6e4272254..c9b15606a 100644
--- a/group_vars/osds
+++ b/group_vars/osds
@@ -2,6 +2,9 @@
 # Variables here are applicable to all host groups NOT roles
 #
 
+# Dummy variable to avoid error because ansible does not recognize the file as a good configuration file when no variable in it.
+dummy:
+
 # Devices to be used as OSDs
 # You can pre-provision disks that are not present yet.
 # Ansible will just skip them. Newly added disk will be