diff --git a/dlls/winsock/socket.c b/dlls/winsock/socket.c
index a07c5b423a5..8ca3a3e36c8 100644
--- a/dlls/winsock/socket.c
+++ b/dlls/winsock/socket.c
@@ -3235,8 +3235,8 @@ int WINAPI GetAddrInfoW(LPCWSTR nodename, LPCWSTR servname, const ADDRINFOW *hin
     return EAI_FAIL;
 }
 
-int WINAPI WS_getnameinfo(const struct WS_sockaddr *sa, socklen_t salen, char *host,
-                          DWORD hostlen, char *serv, DWORD servlen, int flags)
+int WINAPI WS_getnameinfo(const SOCKADDR *sa, socklen_t salen, PCHAR host,
+                          DWORD hostlen, PCHAR serv, DWORD servlen, INT flags)
 {
 #if HAVE_GETNAMEINFO
     int ret;
diff --git a/include/ws2tcpip.h b/include/ws2tcpip.h
index 16efab6da96..9847dab23ee 100644
--- a/include/ws2tcpip.h
+++ b/include/ws2tcpip.h
@@ -215,7 +215,7 @@ int WINAPI  WS(getaddrinfo)(const char*,const char*,const struct WS(addrinfo)*,s
 #define     GetAddrInfoA WS(getaddrinfo)
 int WINAPI  GetAddrInfoW(PCWSTR,PCWSTR,const ADDRINFOW*,PADDRINFOW*);
 #define     GetAddrInfo WINELIB_NAME_AW(GetAddrInfo)
-int WINAPI  WS(getnameinfo)(const struct WS(sockaddr)*,socklen_t,char*,DWORD,char*,DWORD,int);
+int WINAPI  WS(getnameinfo)(const SOCKADDR*,socklen_t,PCHAR,DWORD,PCHAR,DWORD,INT);
 #define     GetNameInfoA WS(getnameinfo)
 INT WINAPI  GetNameInfoW(const SOCKADDR*,socklen_t,PWCHAR,DWORD,PWCHAR,DWORD,INT);
 #define     GetNameInfo WINELIB_NAME_AW(GetNameInfo)
diff --git a/tools/winapi/win32.api b/tools/winapi/win32.api
index aa1988359e7..8911a2dd92e 100644
--- a/tools/winapi/win32.api
+++ b/tools/winapi/win32.api
@@ -5347,6 +5347,7 @@ WSAESETSERVICEOP
 WSAEVENT
 int
 long
+socklen_t
 u_long
 u_short
 
@@ -5378,6 +5379,7 @@ LPWSAQUERYSETW
 LPWSASERVICECLASSINFOA
 LPWSASERVICECLASSINFOW
 PADDRINFOW *
+SOCKADDR *
 WS_fd_set *
 int *
 struct WS_addrinfo *
@@ -5394,6 +5396,7 @@ u_short *
 
 LPCSTR
 LPSTR
+PCHAR
 char *
 
 %unknown