diff --git a/reactos/w32api/include/ws2tcpip.h b/reactos/w32api/include/ws2tcpip.h
index 259237f92cd..03ac8cf6458 100644
--- a/reactos/w32api/include/ws2tcpip.h
+++ b/reactos/w32api/include/ws2tcpip.h
@@ -306,8 +306,15 @@ WCHAR* WSAAPI gai_strerrorW(int);
 #define gai_strerror   gai_strerrorA
 #endif  /* UNICODE */
 
-int WSAAPI getnameinfo(const struct sockaddr*,socklen_t,char*,DWORD,
-		       char*,DWORD,int);
+int WSAAPI getnameinfoA(const struct sockaddr*,socklen_t,char*,DWORD,
+		        char*,DWORD,int);
+int WSAAPI getnameinfoW(const struct sockaddr*,socklen_t,WCHAR*,DWORD,
+		        WCHAR*,DWORD,int);
+#ifdef UNICODE
+#define getnameinfo   getnameinfoW
+#else
+#define getnameinfo   getnameinfoA
+#endif  /* UNICODE */
 
 
 /* Some older IPv4/IPv6 compatability stuff */