diff --git a/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp b/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp
index 6738f28fa..4d3f40d23 100644
--- a/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp
+++ b/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp
@@ -60,8 +60,7 @@ using namespace std;
 #define SCALE_3_8(VAL_) ((VAL_) * 0x24)
 #define SCALE_8_3(VAL_) ((VAL_) / 0x24)
 
-#define SCREEN_WIDTH 320
-#define SCREEN_HEIGHT 240
+// SCREEN_WIDTH and SCREEN_HEIGHT are defined in the headerfile
 #define HALF_SCREEN_WIDTH (SCREEN_WIDTH / 2)
 #define HALF_SCREEN_HEIGHT (SCREEN_HEIGHT / 2)
 
@@ -2662,15 +2661,15 @@ void gfx_get_dimensions(uint32_t *width, uint32_t *height) {
     gfx_wapi->get_dimensions(width, height);
 }
 
-void gfx_init(struct GfxWindowManagerAPI *wapi, struct GfxRenderingAPI *rapi, const char *game_name, bool start_in_fullscreen) {
+void gfx_init(struct GfxWindowManagerAPI *wapi, struct GfxRenderingAPI *rapi, const char *game_name, bool start_in_fullscreen, uint32_t screen_width, uint32_t screen_height) {
     gfx_wapi = wapi;
     gfx_rapi = rapi;
     gfx_wapi->init(game_name, start_in_fullscreen);
     gfx_rapi->init();
-    gfx_rapi->update_framebuffer_parameters(0, SCREEN_WIDTH, SCREEN_HEIGHT, 1, false, true, true, true);
+    gfx_rapi->update_framebuffer_parameters(0, screen_width, screen_height, 1, false, true, true, true);
     gfx_current_dimensions.internal_mul = 1;
-    gfx_current_dimensions.width = SCREEN_WIDTH;
-    gfx_current_dimensions.height = SCREEN_HEIGHT;
+    gfx_current_dimensions.width = screen_width;
+    gfx_current_dimensions.height = screen_height;
     game_framebuffer = gfx_rapi->create_framebuffer();
     game_framebuffer_msaa_resolved = gfx_rapi->create_framebuffer();
 
diff --git a/libultraship/libultraship/Lib/Fast3D/gfx_pc.h b/libultraship/libultraship/Lib/Fast3D/gfx_pc.h
index 2ecb68898..bf3b199fc 100644
--- a/libultraship/libultraship/Lib/Fast3D/gfx_pc.h
+++ b/libultraship/libultraship/Lib/Fast3D/gfx_pc.h
@@ -8,6 +8,9 @@
 
 #include "U64/PR/ultra64/types.h"
 
+#define SCREEN_WIDTH 320
+#define SCREEN_HEIGHT 240
+
 struct GfxRenderingAPI;
 struct GfxWindowManagerAPI;
 
@@ -62,7 +65,7 @@ extern uint32_t gfx_msaa_level;
 
 }
 
-void gfx_init(struct GfxWindowManagerAPI* wapi, struct GfxRenderingAPI* rapi, const char* game_name, bool start_in_fullscreen);
+void gfx_init(struct GfxWindowManagerAPI* wapi, struct GfxRenderingAPI* rapi, const char* game_name, bool start_in_fullscreen, uint32_t screen_width = SCREEN_WIDTH, uint32_t screen_height = SCREEN_HEIGHT);
 struct GfxRenderingAPI* gfx_get_current_rendering_api(void);
 void gfx_start_frame(void);
 void gfx_run(Gfx* commands, const std::unordered_map<Mtx*, MtxF>& mtx_replacements);
diff --git a/libultraship/libultraship/Window.cpp b/libultraship/libultraship/Window.cpp
index bbd906c76..d2240928e 100644
--- a/libultraship/libultraship/Window.cpp
+++ b/libultraship/libultraship/Window.cpp
@@ -264,15 +264,18 @@ namespace Ship {
 
         SetAudioPlayer();
         bIsFullscreen = Ship::stob(Conf["WINDOW"]["FULLSCREEN"]);
-        dwWidth = Ship::stoi(Conf["WINDOW"]["WINDOW WIDTH"], 320);
-        dwHeight = Ship::stoi(Conf["WINDOW"]["WINDOW HEIGHT"], 240);
-        dwWidth = Ship::stoi(Conf["WINDOW"]["FULLSCREEN WIDTH"], 1920);
-        dwHeight = Ship::stoi(Conf["WINDOW"]["FULLSCREEN HEIGHT"], 1080);
+        if (bIsFullscreen) {
+            dwWidth = Ship::stoi(Conf["WINDOW"]["FULLSCREEN WIDTH"], 1920);
+            dwHeight = Ship::stoi(Conf["WINDOW"]["FULLSCREEN HEIGHT"], 1080);
+        } else {
+            dwWidth = Ship::stoi(Conf["WINDOW"]["WINDOW WIDTH"], 320);
+            dwHeight = Ship::stoi(Conf["WINDOW"]["WINDOW HEIGHT"], 240);
+        }
         dwMenubar = Ship::stoi(Conf["WINDOW"]["menubar"], 0);
         const std::string& gfx_backend = Conf["WINDOW"]["GFX BACKEND"];
         SetWindowManager(&WmApi, &RenderingApi, gfx_backend);
 
-        gfx_init(WmApi, RenderingApi, GetContext()->GetName().c_str(), bIsFullscreen);
+        gfx_init(WmApi, RenderingApi, GetContext()->GetName().c_str(), bIsFullscreen, dwWidth, dwHeight);
         WmApi->set_fullscreen_changed_callback(Window::OnFullscreenChanged);
         WmApi->set_keyboard_callbacks(Window::KeyDown, Window::KeyUp, Window::AllKeysUp);
     }