diff --git a/src/PVE/Storage/RBDPlugin.pm b/src/PVE/Storage/RBDPlugin.pm
index f45ad3f..680e922 100644
--- a/src/PVE/Storage/RBDPlugin.pm
+++ b/src/PVE/Storage/RBDPlugin.pm
@@ -389,6 +389,7 @@ sub properties {
 	krbd => {
 	    description => "Always access rbd through krbd kernel module.",
 	    type => 'boolean',
+	    default => 0,
 	},
 	keyring => {
 	    description => "Client keyring contents (for external clusters).",