diff --git a/dlls/dplayx/tests/dplayx.c b/dlls/dplayx/tests/dplayx.c
index da3a9b533c2..cb3dd75912a 100644
--- a/dlls/dplayx/tests/dplayx.c
+++ b/dlls/dplayx/tests/dplayx.c
@@ -1224,12 +1224,14 @@ static void checkGameMessage_( int line, GameMessage *message, DPID expectedFrom
 static unsigned short receiveEnumSessionsRequest_( int line, SOCKET sock, const GUID *expectedAppGuid,
                                                    const WCHAR *expectedPassword, DWORD expectedFlags )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
         EnumSessionsRequest request;
         WCHAR password[ 256 ];
     } request;
+#include "poppack.h"
     DWORD expectedPasswordSize;
     unsigned short port;
     DWORD expectedSize;
@@ -1267,6 +1269,7 @@ static unsigned short receiveEnumSessionsRequest_( int line, SOCKET sock, const
 #define sendEnumSessionsReply( sock, port, dpsd ) sendEnumSessionsReply_( __LINE__, sock, port, dpsd )
 static void sendEnumSessionsReply_( int line, SOCKET sock, unsigned short port, const DPSESSIONDESC2 *dpsd )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -1295,6 +1298,7 @@ static void sendEnumSessionsReply_( int line, SOCKET sock, unsigned short port,
             .nameOffset = sizeof( reply.reply ),
         },
     };
+#include "poppack.h"
     DWORD passwordSize;
     int wsResult;
     DWORD size;
@@ -1314,11 +1318,13 @@ static void sendEnumSessionsReply_( int line, SOCKET sock, unsigned short port,
 #define receiveRequestPlayerId( sock, expectedFlags, flagsTodo ) receiveRequestPlayerId_( __LINE__, sock, expectedFlags, flagsTodo )
 static unsigned short receiveRequestPlayerId_( int line, SOCKET sock, DWORD expectedFlags )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
         RequestPlayerId request;
     } request;
+#include "poppack.h"
     unsigned short port;
     int wsResult;
 
@@ -1335,6 +1341,7 @@ static unsigned short receiveRequestPlayerId_( int line, SOCKET sock, DWORD expe
 #define sendRequestPlayerReply( sock, port, id, result ) sendRequestPlayerReply_( __LINE__, sock, port, id, result )
 static void sendRequestPlayerReply_( int line, SOCKET sock, unsigned short port, DPID id, HRESULT result )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -1362,6 +1369,7 @@ static void sendRequestPlayerReply_( int line, SOCKET sock, unsigned short port,
             .result = result,
         },
     };
+#include "poppack.h"
     int wsResult;
 
     wsResult = send( sock, (char *) &reply, sizeof( reply ), 0 );
@@ -1374,11 +1382,13 @@ static unsigned short receiveAddForwardRequest_( int line, SOCKET sock, DPID exp
                                                  const WCHAR *expectedPassword, DWORD expectedTickCount,
                                                  unsigned short *udpPort )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
         AddForwardRequest request;
     } request;
+#include "poppack.h"
     DWORD expectedPasswordSize;
     WCHAR password[ 256 ];
     unsigned short port;
@@ -1427,6 +1437,7 @@ static void sendSuperEnumPlayersReply_( int line, SOCKET sock, unsigned short tc
 {
 #define SHORT_NAME L"short name"
 #define LONG_NAME L"long name"
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -1545,6 +1556,7 @@ static void sendSuperEnumPlayersReply_( int line, SOCKET sock, unsigned short tc
             },
         },
     };
+#include "poppack.h"
 #undef LONG_NAME
 #undef SHORT_NAME
     int wsResult;
@@ -1561,6 +1573,7 @@ static void sendSuperEnumPlayersReply_( int line, SOCKET sock, unsigned short tc
 #define sendAddForwardReply( sock, port, result ) sendAddForwardReply_( __LINE__, sock, port, result )
 static void sendAddForwardReply_( int line, SOCKET sock, unsigned short port, HRESULT result )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -1587,6 +1600,7 @@ static void sendAddForwardReply_( int line, SOCKET sock, unsigned short port, HR
             .result = result,
         },
     };
+#include "poppack.h"
     int wsResult;
 
     wsResult = send( sock, (char *) &reply, sizeof( reply ), 0 );
@@ -1596,6 +1610,7 @@ static void sendAddForwardReply_( int line, SOCKET sock, unsigned short port, HR
 #define sendAddForward( sock, port, tcpPort, udpPort ) sendAddForward_( __LINE__, sock, port, tcpPort, udpPort )
 static void sendAddForward_( int line, SOCKET sock, unsigned short port, unsigned short tcpPort, unsigned short udpPort )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -1653,6 +1668,7 @@ static void sendAddForward_( int line, SOCKET sock, unsigned short port, unsigne
             },
         },
     };
+#include "poppack.h"
 
     int wsResult;
 
@@ -1663,11 +1679,13 @@ static void sendAddForward_( int line, SOCKET sock, unsigned short port, unsigne
 #define receiveAddForwardAck( sock, expectedPlayerId ) receiveAddForwardAck_( __LINE__, sock, expectedPlayerId )
 static unsigned short receiveAddForwardAck_( int line, SOCKET sock, DPID expectedPlayerId )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
         AddForwardAck request;
     } request;
+#include "poppack.h"
     unsigned short port;
     int wsResult;
 
@@ -1688,11 +1706,13 @@ static unsigned short receiveCreatePlayer_( int line, SOCKET sock, DPID expected
                                             const WCHAR *expectedShortName, const WCHAR *expectedLongName,
                                             void *expectedPlayerData, DWORD expectedPlayerDataSize )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
         CreatePlayer request;
     } request;
+#include "poppack.h"
     DWORD expectedShortNameSize;
     DWORD expectedLongNameSize;
     WCHAR shortName[ 256 ];
@@ -1775,6 +1795,7 @@ static unsigned short receiveCreatePlayer_( int line, SOCKET sock, DPID expected
 static void sendCreatePlayer_( int line, SOCKET sock, unsigned short tcpPort, unsigned short udpPort,
                                const WCHAR *shortName, const WCHAR *longName, void *playerData, DWORD playerDataSize )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -1820,6 +1841,7 @@ static void sendCreatePlayer_( int line, SOCKET sock, unsigned short tcpPort, un
             },
         },
     };
+#include "poppack.h"
     SpData spData = {
         .tcpAddr.sin_family = AF_INET,
         .tcpAddr.sin_port = htons( tcpPort ),
@@ -1877,12 +1899,14 @@ static void sendCreatePlayer_( int line, SOCKET sock, unsigned short tcpPort, un
 static unsigned short receiveGuaranteedGameMessage_( int line, SOCKET sock, DPID expectedFromId, DPID expectedToId,
                                                      void *expectedData, DWORD expectedDataSize )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
         GameMessage request;
         BYTE data[ 256 ];
     } request;
+#include "poppack.h"
     unsigned short port;
     int wsResult;
 
@@ -1903,11 +1927,13 @@ static unsigned short receiveGuaranteedGameMessage_( int line, SOCKET sock, DPID
 static void receiveGameMessage_( int line, SOCKET sock, DPID expectedFromId, DPID expectedToId, void *expectedData,
                                  DWORD expectedDataSize )
 {
+#include "pshpack1.h"
     struct
     {
         GameMessage request;
         BYTE data[ 256 ];
     } request;
+#include "poppack.h"
     int wsResult;
 
     DWORD expectedSize = sizeof( request.request ) + expectedDataSize;
@@ -1924,6 +1950,7 @@ static void receiveGameMessage_( int line, SOCKET sock, DPID expectedFromId, DPI
 static void sendGuaranteedGameMessage_( int line, SOCKET sock, unsigned short port, DPID fromId, DPID toId, void *data,
                                         DWORD dataSize )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -1945,6 +1972,7 @@ static void sendGuaranteedGameMessage_( int line, SOCKET sock, unsigned short po
             .toId = toId,
         }
     };
+#include "poppack.h"
     int wsResult;
 
     wsResult = send( sock, (char *) &request, sizeof( request ), 0 );
@@ -1958,6 +1986,7 @@ static void sendGuaranteedGameMessage_( int line, SOCKET sock, unsigned short po
         sendGameMessage_( __LINE__, sock, fromId, toId, data, dataSize )
 static void sendGameMessage_( int line, SOCKET sock, DPID fromId, DPID toId, void *data, DWORD dataSize )
 {
+#include "pshpack1.h"
     struct
     {
         GameMessage request;
@@ -1970,6 +1999,7 @@ static void sendGameMessage_( int line, SOCKET sock, DPID fromId, DPID toId, voi
             .toId = toId,
         }
     };
+#include "poppack.h"
     int wsResult;
     DWORD size;
 
@@ -1985,6 +2015,7 @@ static void sendGameMessage_( int line, SOCKET sock, DPID fromId, DPID toId, voi
         sendPing_( __LINE__, sock, port, fromId, tickCount )
 static void sendPing_( int line, SOCKET sock, unsigned short port, DPID fromId, DWORD tickCount )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
@@ -2012,6 +2043,7 @@ static void sendPing_( int line, SOCKET sock, unsigned short port, DPID fromId,
             .tickCount = tickCount,
         }
     };
+#include "poppack.h"
     int wsResult;
 
     wsResult = send( sock, (char *) &request, sizeof( request ), 0 );
@@ -2022,11 +2054,13 @@ static void sendPing_( int line, SOCKET sock, unsigned short port, DPID fromId,
         receivePingReply_( __LINE__, sock, expectedFromId, expectedTickCount )
 static unsigned short receivePingReply_( int line, SOCKET sock, DPID expectedFromId, DWORD expectedTickCount )
 {
+#include "pshpack1.h"
     struct
     {
         SpHeader spHeader;
         Ping request;
     } request;
+#include "poppack.h"
     unsigned short port;
     int wsResult;