diff --git a/Sandboxie/core/dll/guimisc.c b/Sandboxie/core/dll/guimisc.c
index 9a885883..22367e7a 100644
--- a/Sandboxie/core/dll/guimisc.c
+++ b/Sandboxie/core/dll/guimisc.c
@@ -1472,12 +1472,12 @@ _FX BOOL Gui_ImmAssociateContextEx(
 _FX HDC Gui_GetDC(HWND hWnd)
 {
 	if (SbieApi_QueryConfBool(NULL, L"IsBlockCapture", FALSE)) {
-		if (hWnd == NULL || hWnd == GetDesktopWindow()) {
+		if (hWnd == NULL || hWnd == __sys_GetDesktopWindow()) {
 			SetLastError(ERROR_ACCESS_DENIED);
 			return NULL;
 		}
 		ULONG_PTR pid=0, tid=0;
-		if (!Gui_IsSameBox(hWnd, pid, tid)) {
+		if (!Gui_IsSameBox(hWnd, &pid, &tid)) {
 			SetLastError(ERROR_ACCESS_DENIED);
 			return NULL;
 		}
@@ -1488,12 +1488,12 @@ _FX HDC Gui_GetDC(HWND hWnd)
 _FX HDC Gui_GetWindowDC(HWND hWnd)
 {
 	if (SbieApi_QueryConfBool(NULL, L"IsBlockCapture", FALSE)) {
-		if (hWnd == NULL || hWnd == GetDesktopWindow()) {
+		if (hWnd == NULL || hWnd == __sys_GetDesktopWindow()) {
 			SetLastError(ERROR_ACCESS_DENIED);
 			return NULL;
 		}
 		ULONG_PTR pid = 0, tid = 0;
-		if (!Gui_IsSameBox(hWnd, pid, tid)) {
+		if (!Gui_IsSameBox(hWnd, &pid, &tid)) {
 			SetLastError(ERROR_ACCESS_DENIED);
 			return NULL;
 		}
@@ -1504,12 +1504,13 @@ _FX HDC Gui_GetWindowDC(HWND hWnd)
 _FX HDC Gui_GetDCEx(HWND hWnd,HRGN  hrgnClip,DWORD flags)
 {
 	if (SbieApi_QueryConfBool(NULL, L"IsBlockCapture", FALSE)) {
-		if (hWnd == NULL || hWnd == GetDesktopWindow()) {
+		if (hWnd == NULL || hWnd == __sys_GetDesktopWindow()) {
 			SetLastError(ERROR_ACCESS_DENIED);
 			return NULL;
 		}
 		ULONG_PTR pid = 0, tid = 0;
-		if (!Gui_IsSameBox(hWnd, pid, tid)) {
+
+		if (!Gui_IsSameBox(hWnd, &pid, &tid)) {
 			SetLastError(ERROR_ACCESS_DENIED);
 			return NULL;
 		}