diff --git a/internal/core/machine.go b/internal/core/machine.go
index b6dc3d14c..3fdd57168 100644
--- a/internal/core/machine.go
+++ b/internal/core/machine.go
@@ -70,8 +70,7 @@ func (m *Machine) SetMachineState(state *core.MachineState) (err error) {
 	return
 }
 
-// UID implements core.Machine
-func (m *Machine) UID() (userId int, err error) {
+func (m *Machine) UID() (userId int32, err error) {
 	return
 }