diff --git a/reactos/base/applications/games/winmine/main.c b/reactos/base/applications/games/winmine/main.c
index b000b04e9be..b25cb13a17f 100644
--- a/reactos/base/applications/games/winmine/main.c
+++ b/reactos/base/applications/games/winmine/main.c
@@ -885,7 +885,7 @@ static LRESULT WINAPI MainProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lPara
 
     case WM_LBUTTONDOWN:
         WINE_TRACE("WM_LBUTTONDOWN\n");
-        if( wParam & MK_RBUTTON )
+        if( wParam & (MK_RBUTTON | MK_SHIFT) )
             msg = WM_MBUTTONDOWN;
         TestBoard( hWnd, &board, (short)LOWORD(lParam), (short)HIWORD(lParam), msg );
         SetCapture( hWnd );
@@ -893,7 +893,7 @@ static LRESULT WINAPI MainProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lPara
 
     case WM_LBUTTONUP:
         WINE_TRACE("WM_LBUTTONUP\n");
-        if( wParam & MK_RBUTTON )
+        if( wParam & (MK_RBUTTON | MK_SHIFT) )
             msg = WM_MBUTTONUP;
         TestBoard( hWnd, &board, (short)LOWORD(lParam), (short)HIWORD(lParam), msg );
         ReleaseCapture();