diff --git a/app.rb b/app.rb
index ec5eaba..48fe183 100644
--- a/app.rb
+++ b/app.rb
@@ -101,7 +101,7 @@ helpers do
     device.open do |handle|
       handle.auto_detach_kernel_driver = true # usblp kernel driver otherwise holds the interface
       handle.claim_interface(0) do
-        handle.bulk_transfer(endpoint: DATAMAX_ENDPOINT, dataOut: data)
+        handle.bulk_transfer(endpoint: DATAMAX_ENDPOINT, dataOut: data, timeout: 30_000) # USB 1.1, large ZPL payloads need more than the 1s default
       end
     end
   end