diff --git a/Src/OSD/SDL/Main.cpp b/Src/OSD/SDL/Main.cpp
index fdf787d..c706d90 100644
--- a/Src/OSD/SDL/Main.cpp
+++ b/Src/OSD/SDL/Main.cpp
@@ -962,12 +962,19 @@ int Supermodel(const Game &game, ROMSet *rom_set, IEmulator *Model3, CInputs *In
   char titleStr[128];
   totalXRes = xRes = s_runtime_config["XResolution"].ValueAs<unsigned>();
   totalYRes = yRes = s_runtime_config["YResolution"].ValueAs<unsigned>();
+  bool fullscreen = s_runtime_config["FullScreen"].ValueAs<bool>();
+  if (fullscreen) {
+    SDL_Rect g_logical_rect = {0, 0, 0, 0};
+    SDL_GetDisplayBounds(0, &g_logical_rect);
+    totalXRes = g_logical_rect.w;
+    totalYRes = g_logical_rect.h;
+  }
   sprintf(baseTitleStr, "Supermodel - %s", game.title.c_str());
   SDL_SetWindowTitle(s_window, baseTitleStr);
   SDL_SetWindowSize(s_window, totalXRes, totalYRes);
   SDL_SetWindowPosition(s_window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
   bool stretch = s_runtime_config["Stretch"].ValueAs<bool>();
-  bool fullscreen = s_runtime_config["FullScreen"].ValueAs<bool>();
+
   if (OKAY != ResizeGLScreen(&xOffset, &yOffset ,&xRes, &yRes, &totalXRes, &totalYRes, !stretch, fullscreen))
     return 1;