diff --git a/internal/allocation/allocation_manager_test.go b/internal/allocation/allocation_manager_test.go
index 0374bc4f..77c4be11 100644
--- a/internal/allocation/allocation_manager_test.go
+++ b/internal/allocation/allocation_manager_test.go
@@ -20,6 +20,8 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+var errUnexpectedTestUsername = errors.New("unexpected user name")
+
 func TestManager(t *testing.T) {
 	tt := []struct {
 		name string
@@ -182,7 +184,7 @@ func newTestManager(expectedUsername string) (*Manager, error) {
 		LeveledLogger: loggerFactory.NewLogger("test"),
 		AllocatePacketConn: func(_ string, _ int, username string) (net.PacketConn, net.Addr, error) {
 			if username != expectedUsername {
-				return nil, nil, errors.New("unexpected user name")
+				return nil, nil, errUnexpectedTestUsername
 			}
 			conn, err := net.ListenPacket("udp4", "0.0.0.0:0")
 			if err != nil {