diff --git a/include/ntapi/nt_socket.h b/include/ntapi/nt_socket.h
index d56f370..68a26b1 100644
--- a/include/ntapi/nt_socket.h
+++ b/include/ntapi/nt_socket.h
@@ -426,7 +426,8 @@ typedef int32_t __cdecl ntapi_sc_bind(
 	__in	nt_socket *		hssocket,
 	__in	const nt_sockaddr *	addr,
 	__in	uintptr_t		addrlen,
-	__in	uintptr_t		service_flags	__optional,
+	__in	uint32_t		afdflags	__optional,
+	__in	uint32_t		srvflags	__optional,
 	__out	nt_sockaddr *		sockaddr	__optional,
 	__out	nt_io_status_block *	iosb		__optional);
 
diff --git a/src/socket/ntapi_sc_bind_v1.c b/src/socket/ntapi_sc_bind_v1.c
index bf07a60..df3e84f 100644
--- a/src/socket/ntapi_sc_bind_v1.c
+++ b/src/socket/ntapi_sc_bind_v1.c
@@ -35,7 +35,8 @@ int32_t __cdecl __ntapi_sc_bind_v1(
 	__in		nt_socket *		hssocket,
 	__in		const nt_sockaddr *	addr,
 	__in		uintptr_t		addrlen,
-	__in		uintptr_t		service_flags	__optional,
+	__in		uint32_t		afdflags	__optional,
+	__in		uint32_t		srvflags	__optional,
 	__out		nt_sockaddr *		sockaddr	__optional,
 	__out		nt_io_status_block *	iosb		__optional)
 {
@@ -46,18 +47,19 @@ int32_t __cdecl __ntapi_sc_bind_v1(
 	_addr_memcpy *		src;
 	_addr_memcpy *		dst;
 
+	(void)afdflags;
 	(void)addrlen;
 
 	iosb = iosb ? iosb : &siosb;
 
 	/* service_flags */
-	if (!service_flags)
-		service_flags = 0x2000E;
+	if (!srvflags)
+		srvflags = 0x2000E;
 
 	/* afd_bind_req */
 	afd_bind_req.domain = hssocket->domain;
 	afd_bind_req.type   = hssocket->type;
-	afd_bind_req.service_flags = (uint32_t)service_flags;
+	afd_bind_req.service_flags = srvflags;
 
 	src = (_addr_memcpy *)addr;
 	dst = (_addr_memcpy *)&(afd_bind_req.sa_data);
diff --git a/src/socket/ntapi_sc_bind_v2.c b/src/socket/ntapi_sc_bind_v2.c
index 7be603f..432e534 100644
--- a/src/socket/ntapi_sc_bind_v2.c
+++ b/src/socket/ntapi_sc_bind_v2.c
@@ -12,7 +12,7 @@
 #include "ntapi_impl.h"
 
 typedef struct _nt_afd_bind_request {
-	uint32_t	unknown;
+	uint32_t	flags;
 	nt_sockaddr	addr;
 } nt_afd_bind_request;
 
@@ -32,7 +32,8 @@ int32_t __cdecl __ntapi_sc_bind_v2(
 	__in		nt_socket *		hssocket,
 	__in		const nt_sockaddr *	addr,
 	__in		uintptr_t		addrlen,
-	__in		uintptr_t		service_flags	__optional,
+	__in		uint32_t		afdflags	__optional,
+	__in		uint32_t		srvflags	__optional,
 	__out		nt_sockaddr *		sockaddr	__optional,
 	__out		nt_io_status_block *	iosb		__optional)
 {
@@ -43,7 +44,7 @@ int32_t __cdecl __ntapi_sc_bind_v2(
 	_addr_memcpy *		src;
 	_addr_memcpy *		dst;
 
-	(void)service_flags;
+	(void)srvflags;
 
 	if ((addrlen != sizeof(nt_sockaddr_in4))
 	 && (addrlen != sizeof(nt_sockaddr_in6)))
@@ -52,7 +53,7 @@ int32_t __cdecl __ntapi_sc_bind_v2(
 	iosb = iosb ? iosb : &siosb;
 
 	/* request */
-	afd_bind_req.unknown = hssocket->domain;
+	afd_bind_req.flags = afdflags;
 
 	src = (_addr_memcpy *)addr;
 	dst = (_addr_memcpy *)&(afd_bind_req.addr);