diff --git a/c/sdl.c b/c/sdl.c
index 3bc1578..bf6385f 100644
--- a/c/sdl.c
+++ b/c/sdl.c
@@ -241,16 +241,22 @@ lean_obj_res sdl_render_present(b_lean_obj_arg g_renderer, lean_obj_arg w) {
     return lean_io_result_mk_ok(lean_box(0));
 }
 
+static SDL_Rect lean_sdl_rect_to_c_SDL_Rect(b_lean_obj_arg rect_obj) {
+    return (SDL_Rect) {
+        .x = (int32_t)lean_ctor_get_uint32(rect_obj, 0),
+        .y = (int32_t)lean_ctor_get_uint32(rect_obj, 4),
+        .w = (int32_t)lean_ctor_get_uint32(rect_obj, 8),
+        .h = (int32_t)lean_ctor_get_uint32(rect_obj, 12),
+    };
+}
+
+
 lean_obj_res sdl_render_fill_rect(b_lean_obj_arg g_renderer, b_lean_obj_arg rect_obj) {
     SDL_Renderer* renderer = (SDL_Renderer*)lean_get_external_data(g_renderer);
     if (renderer == NULL) return lean_io_result_mk_error(lean_mk_string("C: Renderer is NULL"));
 
-    int32_t x = (int32_t)lean_ctor_get_uint32(rect_obj, 0);
-    int32_t y = (int32_t)lean_ctor_get_uint32(rect_obj, 4);
-    int32_t w = (int32_t)lean_ctor_get_uint32(rect_obj, 8);
-    int32_t h = (int32_t)lean_ctor_get_uint32(rect_obj, 12);
-
-    SDL_FRect rect = {(float)x, (float)y, (float)w, (float)h};
+    SDL_Rect r = lean_sdl_rect_to_c_SDL_Rect(rect_obj);
+    SDL_FRect rect = {r.x, r.y, r.w, r.h};
     int32_t result = SDL_RenderFillRect(renderer, &rect);
     return lean_io_result_mk_ok(lean_box_uint32(result));
 }