diff --git a/reactos/dll/directx/d3d9/d3d9_caps.c b/reactos/dll/directx/d3d9/d3d9_caps.c
index d87a01021b1..b3af6ef692c 100644
--- a/reactos/dll/directx/d3d9/d3d9_caps.c
+++ b/reactos/dll/directx/d3d9/d3d9_caps.c
@@ -157,7 +157,7 @@ BOOL GetDeviceData(LPD3D9_DEVICEDATA pDeviceData)
     else
     {
         D3D9_DRIVERCAPS DriverCaps;
-        D3D9_UnknownA8h unknownA8h;
+        D3D9_CALLBACKS D3D9Callbacks;
 
         if (FALSE == CanReenableDirectDrawObject(pDeviceData->pUnknown6BC))
         {
@@ -168,7 +168,7 @@ BOOL GetDeviceData(LPD3D9_DEVICEDATA pDeviceData)
         bRet = GetD3D9DriverInfo(
             pDeviceData->pUnknown6BC,
             &DriverCaps,
-            &unknownA8h,
+            &D3D9Callbacks,
             pDeviceData->szDeviceName,
             pDeviceData->hD3DRefDll,
             &GlobalDriverData,
@@ -222,7 +222,7 @@ BOOL GetDeviceData(LPD3D9_DEVICEDATA pDeviceData)
     bRet = GetD3D9DriverInfo(
         pDeviceData->pUnknown6BC,
         &pDeviceData->DriverCaps,
-        &pDeviceData->_UnknownA8h,
+        &pDeviceData->D3D9Callbacks,
         pDeviceData->szDeviceName,
         pDeviceData->hD3DRefDll,
         &GlobalDriverData,
@@ -252,7 +252,7 @@ BOOL GetDeviceData(LPD3D9_DEVICEDATA pDeviceData)
     bRet = GetD3D9DriverInfo(
         pDeviceData->pUnknown6BC,
         &pDeviceData->DriverCaps,
-        &pDeviceData->_UnknownA8h,
+        &pDeviceData->D3D9Callbacks,
         pDeviceData->szDeviceName,
         pDeviceData->hD3DRefDll,
         &GlobalDriverData,
@@ -334,7 +334,7 @@ static void ResetGetDriverInfo2Data(DD_GETDRIVERINFO2DATA* DrvInfo2, DWORD dwTyp
 
 BOOL GetD3D9DriverInfo( D3D9_Unknown6BC* pUnknown6BC,
                         LPD3D9_DRIVERCAPS pDriverCaps,
-                        D3D9_UnknownA8h* pUnknownA8h,
+                        D3D9_CALLBACKS* pD3D9Callbacks,
                         LPCSTR lpszDeviceName,
                         HMODULE hD3dRefDll,
                         D3DHAL_GLOBALDRIVERDATA* pGblDriverData,
diff --git a/reactos/dll/directx/d3d9/d3d9_caps.h b/reactos/dll/directx/d3d9/d3d9_caps.h
index de4bcf5253e..6d23bda8961 100644
--- a/reactos/dll/directx/d3d9/d3d9_caps.h
+++ b/reactos/dll/directx/d3d9/d3d9_caps.h
@@ -22,7 +22,7 @@ BOOL CanReenableDirectDrawObject(D3D9_Unknown6BC* ppUnknown);
 
 BOOL GetD3D9DriverInfo( D3D9_Unknown6BC* pUnknown6BC,
                         LPD3D9_DRIVERCAPS pDriverCaps,
-                        D3D9_UnknownA8h* pUnknownA8h,
+                        D3D9_CALLBACKS* pD3D9Callbacks,
                         LPCSTR lpszDeviceName,
                         HMODULE hD3dRefDll,
                         D3DHAL_GLOBALDRIVERDATA* pGblDriverData,
diff --git a/reactos/dll/directx/d3d9/d3d9_create.c b/reactos/dll/directx/d3d9/d3d9_create.c
index 8b37b848ebc..0d41ee8ca29 100644
--- a/reactos/dll/directx/d3d9/d3d9_create.c
+++ b/reactos/dll/directx/d3d9/d3d9_create.c
@@ -139,11 +139,11 @@ static BOOL GetDirect3D9AdapterInfo(IN OUT LPDIRECT3D9_DISPLAYADAPTER pDisplayAd
 
     if (pDisplayAdapter->bInUseFlag)
     {
-        pDeviceData->_UnknownA8h.DeviceType = D3DDEVTYPE_HAL;
+        pDeviceData->D3D9Callbacks.DeviceType = D3DDEVTYPE_HAL;
     }
     else if (IsGDIDriver(hDC))
     {
-        pDeviceData->_UnknownA8h.DeviceType = D3DDEVTYPE_REF;
+        pDeviceData->D3D9Callbacks.DeviceType = D3DDEVTYPE_REF;
     }
 
     if (FALSE == GetDeviceData(pDeviceData))
diff --git a/reactos/dll/directx/d3d9/d3d9_private.h b/reactos/dll/directx/d3d9/d3d9_private.h
index bb98dacf670..c45795648d2 100644
--- a/reactos/dll/directx/d3d9/d3d9_private.h
+++ b/reactos/dll/directx/d3d9/d3d9_private.h
@@ -26,6 +26,7 @@ typedef struct _D3D9Unknown6BC_
 /* 0x0030 */    DWORD dwUnknown0030;
 /* 0x0034 */    ULONG DeviceUniq;
 /* 0x0038 */    DWORD dwUnknown0038;
+/* 0x003c */    DWORD dwUnknown003c;
 /* 0x0040 */    D3DFORMAT RawDisplayFormat;
 /* 0x0044 */    D3DFORMAT DisplayFormat;
 /* 0x0048 */    LONG lDisplayPitch;
@@ -84,7 +85,7 @@ typedef struct _tagD3D9_DRIVERCAPS
 /* 0x0174 */    D3DQUERYTYPE* pSupportedQueriesList;
 } D3D9_DRIVERCAPS, FAR *LPD3D9_DRIVERCAPS;
 
-typedef struct _tagUnknownA8h_
+typedef struct _tagD3D9_CALLBACKS
 {
 /* 0x0000 */    DWORD DdCreateSurface;
 /* 0x0004 */    DWORD DdDestroySurface;
@@ -128,12 +129,12 @@ typedef struct _tagUnknownA8h_
 /* 0x009c */    DWORD DXVAExecute;
 /* 0x00a0 */    DWORD DXVAQueryStatus;
 /* 0x00a4 */    D3DDEVTYPE DeviceType;
-} D3D9_UnknownA8h;
+} D3D9_CALLBACKS;
 
 typedef struct _tagD3D9_DEVICEDATA_
 {
 /* 0x0000 */    D3D9_DRIVERCAPS DriverCaps;
-/* 0x0178 */    D3D9_UnknownA8h _UnknownA8h;
+/* 0x0178 */    D3D9_CALLBACKS D3D9Callbacks;
 /* 0x0220 */    CHAR szDeviceName[CCHDEVICENAME];
 /* 0x0240 */    HDC hDC;
 /* 0x0244 */    GUID DisplayGuid;