diff --git a/src/add-ons/kernel/bus_managers/usb/BusManager.cpp b/src/add-ons/kernel/bus_managers/usb/BusManager.cpp
index 07dc0959d8..23769e987c 100644
--- a/src/add-ons/kernel/bus_managers/usb/BusManager.cpp
+++ b/src/add-ons/kernel/bus_managers/usb/BusManager.cpp
@@ -246,9 +246,12 @@ BusManager::_GetDefaultPipe(usb_speed speed)
 					0, 0, speed, 8);
 		if (!fDefaultPipes[speed]) {
 			TRACE_ERROR(("usb BusManager: failed to allocate default pipe\n"));
+			Unlock();
 			return NULL;
 		}
 	}
 	
+	Unlock();
+	
 	return fDefaultPipes[speed];
 }