diff --git a/src/video/sdl2_v.cpp b/src/video/sdl2_v.cpp
index 28ce0f880d..aa7a23c728 100644
--- a/src/video/sdl2_v.cpp
+++ b/src/video/sdl2_v.cpp
@@ -655,7 +655,7 @@ int VideoDriver_SDL::PollEvent()
 		case SDL_WINDOWEVENT: {
 			if (ev.window.event == SDL_WINDOWEVENT_EXPOSED) {
 				// Force a redraw of the entire screen.
-				_num_dirty_rects = MAX_DIRTY_RECTS + 1;
+				this->MakeDirty(0, 0, _screen.width, _screen.height);
 			} else if (ev.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
 				int w = std::max(ev.window.data1, 64);
 				int h = std::max(ev.window.data2, 64);