diff --git a/overlay/device.go b/overlay/device.go
index 8044ee75..cff3ac7d 100644
--- a/overlay/device.go
+++ b/overlay/device.go
@@ -8,10 +8,6 @@ import (
 	"github.com/slackhq/nebula/routing"
 )
 
-// defaultBatchBufSize is the per-Queue scratch size for Read on backends
-// that don't do TSO segmentation. 65535 covers any single IP packet.
-const defaultBatchBufSize = 65535
-
 type Device interface {
 	io.Closer
 	Activate() error