diff --git a/services/usb-device-xous/stm32-usb.rs/firmware/usbd_mass_storage/src/msc.rs b/services/usb-device-xous/stm32-usb.rs/firmware/usbd_mass_storage/src/msc.rs
index 262d5b1a3..a7bc372f1 100644
--- a/services/usb-device-xous/stm32-usb.rs/firmware/usbd_mass_storage/src/msc.rs
+++ b/services/usb-device-xous/stm32-usb.rs/firmware/usbd_mass_storage/src/msc.rs
@@ -37,7 +37,7 @@ impl<B: UsbBus> MscClass<'_, B> {
         MscClass {
             msc_if: alloc.interface(),
             write_ep: alloc.bulk(max_packet_size),
-            write2_ep: alloc.bulk(max_packet_size),
+            write2_ep: alloc.interrupt(64, 5),
             read_ep: alloc.bulk(max_packet_size),
             subclass,
             protocol,