Index: uspace/lib/drv/include/ddf/interrupt.h
===================================================================
--- uspace/lib/drv/include/ddf/interrupt.h	(revision d5c1051faf4391647834d99babdd4a44ee5d9700)
+++ uspace/lib/drv/include/ddf/interrupt.h	(revision e211ea04fccf33d4cb2092f630a29e893e096a02)
@@ -50,7 +50,7 @@
 typedef void interrupt_handler_t(ipc_call_t *, ddf_dev_t *);
 
-extern int register_interrupt_handler(ddf_dev_t *, int, interrupt_handler_t *,
+extern errno_t register_interrupt_handler(ddf_dev_t *, int, interrupt_handler_t *,
     const irq_code_t *, cap_handle_t *);
-extern int unregister_interrupt_handler(ddf_dev_t *, cap_handle_t);
+extern errno_t unregister_interrupt_handler(ddf_dev_t *, cap_handle_t);
 
 #endif