diff --git a/data/common.yaml b/data/common.yaml
index cf12c2c..2c9556a 100644
--- a/data/common.yaml
+++ b/data/common.yaml
@@ -12,6 +12,8 @@ lookup_options:
     merge: deep
   ssh::client::options:
     merge: deep
+  ssh::server_instances:
+    merge: deep
 
 ssh::server::sshd_dir: '/etc/ssh'
 ssh::server::sshd_config: '/etc/ssh/sshd_config'