diff --git a/t/db_dependent/Koha/UI/Form/Builder/Biblio.t b/t/db_dependent/Koha/UI/Form/Builder/Biblio.t
index 1f1e0a1897..4283ca7e81 100755
--- a/t/db_dependent/Koha/UI/Form/Builder/Biblio.t
+++ b/t/db_dependent/Koha/UI/Form/Builder/Biblio.t
@@ -18,7 +18,7 @@
 use Modern::Perl;
 
 use Test::NoWarnings;
-use Test::More tests => 9;
+use Test::More tests => 10;
 use Test::MockModule;
 
 use C4::ClassSource;
@@ -37,6 +37,18 @@ $schema->storage->txn_begin;
 
 use_ok('Koha::UI::Form::Builder::Biblio');
 
+subtest 'new' => sub {
+    plan tests => 1;
+
+    # No warning
+    Koha::UI::Form::Builder::Biblio->new();
+
+    # No warning if passing CGI->param('biblionumber')
+    Koha::UI::Form::Builder::Biblio->new( { biblionumber => undef } );
+
+    ok(1);
+};
+
 subtest 'generate_subfield_form default value' => sub {
     my $builder = Koha::UI::Form::Builder::Biblio->new();