diff --git a/dlls/winsock/socket.c b/dlls/winsock/socket.c
index dfe3b409f3d..178697bf208 100644
--- a/dlls/winsock/socket.c
+++ b/dlls/winsock/socket.c
@@ -3270,3 +3270,31 @@ INT WINAPI WSARecvFrom( SOCKET s, LPWSABUF lpBuffers, DWORD dwBufferCount,
 
   return rc;
 }
+
+
+/***********************************************************************
+ *              WSCInstallProvider             (WS2_32.88)
+ */
+INT WINAPI WSCInstallProvider( const LPGUID lpProviderId,
+                               LPCWSTR lpszProviderDllPath,
+                               const LPWSAPROTOCOL_INFOW lpProtocolInfoList,
+                               DWORD dwNumberOfEntries,
+                               LPINT lpErrno )
+{
+    FIXME("(%s, %s, %p, %ld, %p): stub !\n", debugstr_guid(lpProviderId),
+          debugstr_w(lpszProviderDllPath), lpProtocolInfoList,
+          dwNumberOfEntries, lpErrno);
+    *lpErrno = 0;
+    return 0;
+}
+
+
+/***********************************************************************
+ *              WSCDeinstallProvider             (WS2_32.83)
+ */
+INT WINAPI WSCDeinstallProvider(LPGUID lpProviderId, LPINT lpErrno)
+{
+    FIXME("(%s, %p): stub !\n", debugstr_guid(lpProviderId), lpErrno);
+    *lpErrno = 0;
+    return 0;
+}
diff --git a/dlls/winsock/ws2_32.spec b/dlls/winsock/ws2_32.spec
index 7f83ae31a6c..85ff47dd48b 100644
--- a/dlls/winsock/ws2_32.spec
+++ b/dlls/winsock/ws2_32.spec
@@ -95,12 +95,12 @@ debug_channels (winsock)
 80  stub     WSAStringToAddressA
 81  stub     WSAStringToAddressW
 82  forward  WSAWaitForMultipleEvents KERNEL32.WaitForMultipleObjectsEx
-83  stub     WSCDeinstallProvider
+83  stdcall  WSCDeinstallProvider(ptr ptr) WSCDeinstallProvider
 84  stub     WSCEnableNSProvider
 85  stub     WSCEnumProtocols
 86  stub     WSCGetProviderPath
 87  stub     WSCInstallNameSpace
-88  stub     WSCInstallProvider
+88  stdcall  WSCInstallProvider(ptr wstr ptr long ptr) WSCInstallProvider
 89  stub     WSCUnInstallNameSpace
 90  stub     WSCWriteNameSpaceOrder
 91  stub     WSCWriteProviderOrder
diff --git a/include/winsock2.h b/include/winsock2.h
index f4ee2bdb844..cb97ea042c1 100644
--- a/include/winsock2.h
+++ b/include/winsock2.h
@@ -186,6 +186,33 @@ typedef struct _WSAPROTOCOL_INFOA
     CHAR   szProtocol[WSAPROTOCOL_LEN+1];
 } WSAPROTOCOL_INFOA, * LPWSAPROTOCOL_INFOA;
 
+typedef struct _WSAPROTOCOL_INFOW
+{
+    DWORD dwServiceFlags1;
+    DWORD dwServiceFlags2;
+    DWORD dwServiceFlags3;
+    DWORD dwServiceFlags4;
+    DWORD dwProviderFlags;
+    GUID ProviderId;
+    DWORD dwCatalogEntryId;
+    WSAPROTOCOLCHAIN ProtocolChain;
+    int iVersion;
+    int iAddressFamily;
+    int iMaxSockAddr;
+    int iMinSockAddr;
+    int iSocketType;
+    int iProtocol;
+    int iProtocolMaxOffset;
+    int iNetworkByteOrder;
+    int iSecurityScheme;
+    DWORD dwMessageSize;
+    DWORD dwProviderReserved;
+    WCHAR  szProtocol[WSAPROTOCOL_LEN+1];
+} WSAPROTOCOL_INFOW, * LPWSAPROTOCOL_INFOW;
+
+DECL_WINELIB_TYPE_AW(WSAPROTOCOL_INFO)
+DECL_WINELIB_TYPE_AW(LPWSAPROTOCOL_INFO)
+
 typedef struct _WSANETWORKEVENTS 
 {
   long lNetworkEvents;