diff --git a/reactos/subsystems/win32/win32k/include/desktop.h b/reactos/subsystems/win32/win32k/include/desktop.h
index 0a9f6ae2010..6538ffa5875 100644
--- a/reactos/subsystems/win32/win32k/include/desktop.h
+++ b/reactos/subsystems/win32/win32k/include/desktop.h
@@ -39,6 +39,32 @@ typedef struct _DESKTOP
 #define DF_DESKWNDDESTROYED 0x00010000
 #define DF_DYING            0x00020000
 
+#define DESKTOP_READ       STANDARD_RIGHTS_READ      | \
+                           DESKTOP_ENUMERATE         | \
+                           DESKTOP_READOBJECTS
+
+#define DESKTOP_WRITE       STANDARD_RIGHTS_WRITE    | \
+                            DESKTOP_CREATEMENU       | \
+                            DESKTOP_CREATEWINDOW     | \
+                            DESKTOP_HOOKCONTROL      | \
+                            DESKTOP_JOURNALPLAYBACK  | \
+                            DESKTOP_JOURNALRECORD    | \
+                            DESKTOP_WRITEOBJECTS
+
+#define DESKTOP_EXECUTE     STANDARD_RIGHTS_EXECUTE  | \
+                            DESKTOP_SWITCHDESKTOP
+
+#define DESKTOP_ALL_ACCESS  STANDARD_RIGHTS_REQUIRED | \
+                            DESKTOP_CREATEMENU       | \
+                            DESKTOP_CREATEWINDOW     | \
+                            DESKTOP_ENUMERATE        | \
+                            DESKTOP_HOOKCONTROL      | \
+                            DESKTOP_JOURNALPLAYBACK  | \
+                            DESKTOP_JOURNALRECORD    | \
+                            DESKTOP_READOBJECTS      | \
+                            DESKTOP_SWITCHDESKTOP    | \
+                            DESKTOP_WRITEOBJECTS
+
 extern PDESKTOP InputDesktop;
 extern HDESK InputDesktopHandle;
 extern PCLS DesktopWindowClass;
diff --git a/reactos/subsystems/win32/win32k/include/winsta.h b/reactos/subsystems/win32/win32k/include/winsta.h
index 7fda4ab0f39..35fa4c7eff8 100644
--- a/reactos/subsystems/win32/win32k/include/winsta.h
+++ b/reactos/subsystems/win32/win32k/include/winsta.h
@@ -69,6 +69,32 @@ extern WINSTATION_OBJECT *InputWindowStation;
 extern PPROCESSINFO LogonProcess;
 extern HWND hwndSAS;
 
+#define WINSTA_READ       STANDARD_RIGHTS_READ     | \
+                          WINSTA_ENUMDESKTOPS      | \
+                          WINSTA_ENUMERATE         | \
+                          WINSTA_READATTRIBUTES    | \
+                          WINSTA_READSCREEN
+
+#define WINSTA_WRITE      STANDARD_RIGHTS_WRITE    | \
+                          WINSTA_ACCESSCLIPBOARD   | \
+                          WINSTA_CREATEDESKTOP     | \
+                          WINSTA_WRITEATTRIBUTES
+
+#define WINSTA_EXECUTE    STANDARD_RIGHTS_EXECUTE  | \
+                          WINSTA_ACCESSGLOBALATOMS | \
+                          WINSTA_EXITWINDOWS
+
+#define WINSTA_ACCESS_ALL STANDARD_RIGHTS_REQUIRED | \
+                          WINSTA_ACCESSCLIPBOARD   | \
+                          WINSTA_ACCESSGLOBALATOMS | \
+                          WINSTA_CREATEDESKTOP     | \
+                          WINSTA_ENUMDESKTOPS      | \
+                          WINSTA_ENUMERATE         | \
+                          WINSTA_EXITWINDOWS       | \
+                          WINSTA_READATTRIBUTES    | \
+                          WINSTA_READSCREEN        | \
+                          WINSTA_WRITEATTRIBUTES
+
 INIT_FUNCTION
 NTSTATUS
 NTAPI
diff --git a/reactos/subsystems/win32/win32k/ntuser/desktop.c b/reactos/subsystems/win32/win32k/ntuser/desktop.c
index d41f0426cd8..1428b9cda0b 100644
--- a/reactos/subsystems/win32/win32k/ntuser/desktop.c
+++ b/reactos/subsystems/win32/win32k/ntuser/desktop.c
@@ -24,28 +24,6 @@ PDESKTOP InputDesktop = NULL;
 HDESK InputDesktopHandle = NULL;
 HDC ScreenDeviceContext = NULL;
 
-GENERIC_MAPPING IntDesktopMapping =
-{
-      STANDARD_RIGHTS_READ     | DESKTOP_ENUMERATE       |
-                                 DESKTOP_READOBJECTS,
-      STANDARD_RIGHTS_WRITE    | DESKTOP_CREATEMENU      |
-                                 DESKTOP_CREATEWINDOW    |
-                                 DESKTOP_HOOKCONTROL     |
-                                 DESKTOP_JOURNALPLAYBACK |
-                                 DESKTOP_JOURNALRECORD   |
-                                 DESKTOP_WRITEOBJECTS,
-      STANDARD_RIGHTS_EXECUTE  | DESKTOP_SWITCHDESKTOP,
-      STANDARD_RIGHTS_REQUIRED | DESKTOP_CREATEMENU      |
-                                 DESKTOP_CREATEWINDOW    |
-                                 DESKTOP_ENUMERATE       |
-                                 DESKTOP_HOOKCONTROL     |
-                                 DESKTOP_JOURNALPLAYBACK |
-                                 DESKTOP_JOURNALRECORD   |
-                                 DESKTOP_READOBJECTS     |
-                                 DESKTOP_SWITCHDESKTOP   |
-                                 DESKTOP_WRITEOBJECTS
-};
-
 /* OBJECT CALLBACKS **********************************************************/
 
 NTSTATUS
@@ -195,9 +173,15 @@ NTSTATUS
 NTAPI
 InitDesktopImpl(VOID)
 {
+    GENERIC_MAPPING IntDesktopMapping = { DESKTOP_READ,
+                                          DESKTOP_WRITE,
+                                          DESKTOP_EXECUTE,
+                                          DESKTOP_ALL_ACCESS};
+
     /* Set Desktop Object Attributes */
     ExDesktopObjectType->TypeInfo.DefaultNonPagedPoolCharge = sizeof(DESKTOP);
     ExDesktopObjectType->TypeInfo.GenericMapping = IntDesktopMapping;
+    ExDesktopObjectType->TypeInfo.ValidAccessMask = DESKTOP_ALL_ACCESS;
     return STATUS_SUCCESS;
 }
 
@@ -346,7 +330,7 @@ IntParseDesktopPath(PEPROCESS Process,
                                   ExWindowStationObjectType,
                                   KernelMode,
                                   NULL,
-                                  0,
+                                  WINSTA_ACCESS_ALL,
                                   NULL,
                                   (HANDLE*)hWinSta);
 
@@ -380,7 +364,7 @@ IntParseDesktopPath(PEPROCESS Process,
                                   ExDesktopObjectType,
                                   KernelMode,
                                   NULL,
-                                  0,
+                                  DESKTOP_ALL_ACCESS,
                                   NULL,
                                   (HANDLE*)hDesktop);
 
diff --git a/reactos/subsystems/win32/win32k/ntuser/winsta.c b/reactos/subsystems/win32/win32k/ntuser/winsta.c
index edbda779c05..8ea5e617b9c 100644
--- a/reactos/subsystems/win32/win32k/ntuser/winsta.c
+++ b/reactos/subsystems/win32/win32k/ntuser/winsta.c
@@ -22,17 +22,6 @@ HWND hwndSAS = NULL;
 
 /* INITALIZATION FUNCTIONS ****************************************************/
 
-static GENERIC_MAPPING IntWindowStationMapping =
-   {
-      STANDARD_RIGHTS_READ     | WINSTA_ENUMDESKTOPS      | WINSTA_ENUMERATE         | WINSTA_READATTRIBUTES | WINSTA_READSCREEN,
-      STANDARD_RIGHTS_WRITE    | WINSTA_ACCESSCLIPBOARD   | WINSTA_CREATEDESKTOP     | WINSTA_WRITEATTRIBUTES,
-      STANDARD_RIGHTS_EXECUTE  | WINSTA_ACCESSGLOBALATOMS | WINSTA_EXITWINDOWS,
-      STANDARD_RIGHTS_REQUIRED | WINSTA_ACCESSCLIPBOARD   | WINSTA_ACCESSGLOBALATOMS | WINSTA_CREATEDESKTOP  |
-      WINSTA_ENUMDESKTOPS      | WINSTA_ENUMERATE         | WINSTA_EXITWINDOWS    |
-      WINSTA_READATTRIBUTES    | WINSTA_READSCREEN        | WINSTA_WRITEATTRIBUTES
-   };
-
-
 INIT_FUNCTION
 NTSTATUS
 NTAPI
@@ -42,14 +31,17 @@ InitWindowStationImpl(VOID)
    HANDLE WindowStationsDirectory;
    UNICODE_STRING UnicodeString;
    NTSTATUS Status;
+   GENERIC_MAPPING IntWindowStationMapping = { WINSTA_READ,
+                                               WINSTA_WRITE,
+                                               WINSTA_EXECUTE,
+                                               WINSTA_ACCESS_ALL};
 
    /*
     * Create the '\Windows\WindowStations' directory
     */
 
    RtlInitUnicodeString(&UnicodeString, WINSTA_ROOT_NAME);
-   InitializeObjectAttributes(&ObjectAttributes, &UnicodeString,
-                              0, NULL, NULL);
+   InitializeObjectAttributes(&ObjectAttributes, &UnicodeString, 0, NULL, NULL);
    Status = ZwCreateDirectoryObject(&WindowStationsDirectory, 0,
                                     &ObjectAttributes);
    if (!NT_SUCCESS(Status))
@@ -62,6 +54,7 @@ InitWindowStationImpl(VOID)
    /* Set Winsta Object Attributes */
    ExWindowStationObjectType->TypeInfo.DefaultNonPagedPoolCharge = sizeof(WINSTATION_OBJECT);
    ExWindowStationObjectType->TypeInfo.GenericMapping = IntWindowStationMapping;
+   ExWindowStationObjectType->TypeInfo.ValidAccessMask = WINSTA_ACCESS_ALL;
 
    return STATUS_SUCCESS;
 }