diff --git a/src/add-ons/kernel/drivers/disk/usb/usb_disk/usb_disk.cpp b/src/add-ons/kernel/drivers/disk/usb/usb_disk/usb_disk.cpp
index 1ec34087b5..bc712101a8 100644
--- a/src/add-ons/kernel/drivers/disk/usb/usb_disk/usb_disk.cpp
+++ b/src/add-ons/kernel/drivers/disk/usb/usb_disk/usb_disk.cpp
@@ -704,7 +704,7 @@ usb_disk_device_added(usb_device newDevice, void **cookie)
 					continue;
 
 				if (!hasIn && (endpoint->descr->endpoint_address
-					& USB_ENDPOINT_ADDR_DIR_IN)) {
+					& USB_ENDPOINT_ADDR_DIR_IN) != 0) {
 					device->bulk_in = endpoint->handle;
 					hasIn = true;
 				} else if (!hasOut && (endpoint->descr->endpoint_address