Index: uspace/lib/block/block.c
===================================================================
--- uspace/lib/block/block.c	(revision 062d9000625057300f609429080872d6492b542e)
+++ uspace/lib/block/block.c	(revision 38fc00b23a98b60a1d305990084cb0866a575cd0)
@@ -255,6 +255,6 @@
 	.key_hash = cache_key_hash,
 	.key_equal = cache_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };
 
Index: uspace/lib/c/generic/async.c
===================================================================
--- uspace/lib/c/generic/async.c	(revision 062d9000625057300f609429080872d6492b542e)
+++ uspace/lib/c/generic/async.c	(revision 38fc00b23a98b60a1d305990084cb0866a575cd0)
@@ -416,6 +416,6 @@
 	.key_hash = client_key_hash,
 	.key_equal = client_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };
 
@@ -452,6 +452,6 @@
 	.key_hash = conn_key_hash,
 	.key_equal = conn_key_equal,
-	.equal = 0,
-	.remove_callback = 0
+	.equal = NULL,
+	.remove_callback = NULL
 };
 
Index: uspace/lib/nic/src/nic_addr_db.c
===================================================================
--- uspace/lib/nic/src/nic_addr_db.c	(revision 062d9000625057300f609429080872d6492b542e)
+++ uspace/lib/nic/src/nic_addr_db.c	(revision 38fc00b23a98b60a1d305990084cb0866a575cd0)
@@ -107,5 +107,5 @@
 	.key_hash = nic_addr_key_hash,
 	.key_equal = nic_addr_key_equal,
-	.equal = 0,
+	.equal = NULL,
 	.remove_callback = nic_addr_removed
 };