diff --git a/frontend/device/pocketbook/device.lua b/frontend/device/pocketbook/device.lua
index e748d7de5..a644f7567 100644
--- a/frontend/device/pocketbook/device.lua
+++ b/frontend/device/pocketbook/device.lua
@@ -4,6 +4,7 @@ local ffi = require("ffi")
 local C = ffi.C
 local inkview = ffi.load("inkview")
 local band = require("bit").band
+local util = require("util")
 
 require("ffi/posix_h")
 require("ffi/linux_input_h")