Index: uspace/lib/c/include/ipc/dev_iface.h
===================================================================
--- uspace/lib/c/include/ipc/dev_iface.h	(revision b8d5f2bbdd55abe83f2c375691d944798ad9b65a)
+++ uspace/lib/c/include/ipc/dev_iface.h	(revision a31ca11f3fdb5acec686e5b9dd2537e18b5e70f6)
@@ -52,4 +52,7 @@
 	USBHID_DEV_IFACE,
 
+	/** Interface provided by Real Time Clock devices */
+	CLOCK_DEV_IFACE,
+
 	DEV_IFACE_MAX
 } dev_inferface_idx_t;