Index: uspace/lib/usbdev/src/altiface.c
===================================================================
--- uspace/lib/usbdev/src/altiface.c	(revision 69b9740e59780c7c4b0c729b8317a12ad795eac7)
+++ uspace/lib/usbdev/src/altiface.c	(revision 49ff5f3d72bdc099cbcb1c649dfa55c1104f1244)
@@ -167,9 +167,13 @@
 }
 
-void usb_alternate_interfaces_deinit(usb_alternate_interfaces_t *alternate)
+/** Clean initialized structure.
+ * @param instance structure do deinitialize.
+ */
+void usb_alternate_interfaces_deinit(usb_alternate_interfaces_t *instance)
 {
-	if (!alternate)
+	if (!instance)
 		return;
-	free(alternate->alternatives);
+	free(instance->alternatives);
+	instance->alternatives = NULL;
 }
 /**