diff --git a/opts/throttledevice.go b/opts/throttledevice.go
index bdf454eb27..8bf1288047 100644
--- a/opts/throttledevice.go
+++ b/opts/throttledevice.go
@@ -94,7 +94,7 @@ func (opt *ThrottledeviceOpt) String() string {
 
 // GetList returns a slice of pointers to ThrottleDevices.
 func (opt *ThrottledeviceOpt) GetList() []*blkiodev.ThrottleDevice {
-	out := make([]*blkiodev.ThrottleDevice, 0, len(opt.values))
+	out := make([]*blkiodev.ThrottleDevice, len(opt.values))
 	copy(out, opt.values)
 	return out
 }