diff --git a/btrbk b/btrbk
index 3be9a44..216ea53 100755
--- a/btrbk
+++ b/btrbk
@@ -97,7 +97,7 @@ my %config_options = (
   target_preserve_min         => { default => "all",         accept => [qw( all latest no ), qr/[0-9]+[hdwmy]/ ] },
   archive_preserve            => { default => undef,         accept => [qw( no )], accept_preserve_matrix => 1, context => [qw( global )] },
   archive_preserve_min        => { default => "all",         accept => [qw( all latest no ), qr/[0-9]+[hdwmy]/ ], context => [qw( global )] },
-  ssh_identity                => { default => undef,         accept_file => { absolute => 1 } },
+  ssh_identity                => { default => undef,         accept => [qw( no ) ], accept_file => { absolute => 1 } },
   ssh_user                    => { default => "root",        accept => [ qr/[a-z_][a-z0-9_-]*/ ] },
   ssh_compression             => { default => undef,         accept => [qw( yes no )] },
   ssh_cipher_spec             => { default => [ "default" ], accept => [qw( default ), qr/[a-z0-9][a-z0-9@.-]+/ ], split => 1 },