diff --git a/src/sdl/i_video.c b/src/sdl/i_video.c
index 433ce17f7..322b95732 100644
--- a/src/sdl/i_video.c
+++ b/src/sdl/i_video.c
@@ -752,6 +752,7 @@ static void Impl_HandleMouseMotionEvent(SDL_MouseMotionEvent evt)
 		if (SDL_GetMouseFocus() == window && SDL_GetKeyboardFocus() == window)
 		{
 			D_PostEvent(&event);
+			SDL_SetWindowGrab(window, SDL_TRUE);
 			HalfWarpMouse(wwidth, wheight);
 		}
 	}