diff --git a/src/blupi.cpp b/src/blupi.cpp
index 4378375..f1b42c6 100644
--- a/src/blupi.cpp
+++ b/src/blupi.cpp
@@ -404,7 +404,7 @@ static bool DoInit (Sint32 argc, char *argv[])
     // Create a window.
     if (g_bFullScreen)
         g_window = SDL_CreateWindow (NAME, 0, 0, LXIMAGE, LYIMAGE,
-                                     SDL_WINDOW_FULLSCREEN);
+                                     SDL_WINDOW_FULLSCREEN | SDL_WINDOW_INPUT_GRABBED);
     else
         g_window = SDL_CreateWindow (NAME, SDL_WINDOWPOS_CENTERED,
                                      SDL_WINDOWPOS_CENTERED, LXIMAGE, LYIMAGE, 0);