diff --git a/t/db_dependent/api/v1/two_factor_auth.t b/t/db_dependent/api/v1/two_factor_auth.t
index ddb9178e3a..175e6e9529 100755
--- a/t/db_dependent/api/v1/two_factor_auth.t
+++ b/t/db_dependent/api/v1/two_factor_auth.t
@@ -90,7 +90,19 @@ subtest 'registration and verification' => sub {
     $tx = $t->ua->build_tx( POST => "/api/v1/auth/two-factor/registration" );
     $tx->req->cookies( { name => 'CGISESSID', value => $session->id } );
     $tx->req->env( { REMOTE_ADDR => $remote_address } );
-    $t->request_ok($tx)->status_is(201);
+    {
+        # Ignore the following warning
+        # Use of uninitialized value $aMask[1383] in bitwise xor (^) at /usr/local/share/perl/5.36.0/GD/Barcode/QRcode.pm line 217.
+        # We do not want to expect it (using Test::Warn): it is a bug from GD::Barcode
+        local $SIG{__WARN__} = sub { };
+        my $dup_err;
+        local *STDERR;
+        open STDERR, ">>", \$dup_err;
+
+        $t->request_ok($tx)->status_is(201);
+
+        close STDERR;
+    }
     my $secret32 = $t->tx->res->json->{secret32};
 
     $tx = $t->ua->build_tx( POST => "/api/v1/auth/two-factor/registration/verification" );
@@ -120,7 +132,19 @@ subtest 'registration and verification' => sub {
     $tx = $t->ua->build_tx( POST => "/api/v1/auth/two-factor/registration" );
     $tx->req->cookies( { name => 'CGISESSID', value => $session->id } );
     $tx->req->env( { REMOTE_ADDR => $remote_address } );
-    $t->request_ok($tx)->status_is(201);
+    {
+        # Ignore the following warning
+        # Use of uninitialized value $aMask[1383] in bitwise xor (^) at /usr/local/share/perl/5.36.0/GD/Barcode/QRcode.pm line 217.
+        # We do not want to expect it (using Test::Warn): it is a bug from GD::Barcode
+        local $SIG{__WARN__} = sub { };
+        my $dup_err;
+        local *STDERR;
+        open STDERR, ">>", \$dup_err;
+
+        $t->request_ok($tx)->status_is(201);
+
+        close STDERR;
+    }
     $secret32 = $t->tx->res->json->{secret32};
 
     $auth     = Koha::Auth::TwoFactorAuth->new( { patron => $patron, secret32 => $secret32 } );