Index: uspace/srv/ns/service.c
===================================================================
--- uspace/srv/ns/service.c	(revision 062d9000625057300f609429080872d6492b542e)
+++ uspace/srv/ns/service.c	(revision 991d2d88d7bd9717574341fafeefffc28890114c)
@@ -72,6 +72,6 @@
 	.key_hash = service_key_hash,
 	.key_equal = service_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };