diff --git a/manifests/key.pp b/manifests/key.pp
index 5177bf20..911df1a9 100644
--- a/manifests/key.pp
+++ b/manifests/key.pp
@@ -145,10 +145,16 @@ exit \$rv",
     if $inject_as_id {
       $inject_id_option = " --name '${inject_as_id}' "
     }
+    else {
+      $inject_id_option = ''
+    }
 
     if $inject_keyring {
       $inject_keyring_option = " --keyring '${inject_keyring}' "
     }
+    else {
+      $inject_keyring_option = ''
+    }
 
     Ceph_config<||> -> Exec["ceph-injectkey-${name}"]
     Ceph::Mon<||> -> Exec["ceph-injectkey-${name}"]