diff --git a/navy-apps/apps/nslider/src/main.cpp b/navy-apps/apps/nslider/src/main.cpp
index 2fd658b..4ceb869 100644
--- a/navy-apps/apps/nslider/src/main.cpp
+++ b/navy-apps/apps/nslider/src/main.cpp
@@ -28,7 +28,9 @@ void render() {
   char fname[256];
   sprintf(fname, path, cur);
   // slide = SDL_LoadBMP(fname);
-  uint32_t* slide = (uint32_t*)BMP_Load(fname, NULL, NULL);
+  int w, h;
+  uint32_t* slide = (uint32_t*)BMP_Load(fname, &w, &h);
+  NDL_OpenCanvas(&w, &h);
   assert(slide);
   // SDL_UpdateRect(slide, 0, 0, 0, 0);
   NDL_DrawRect(slide, 0, 0, W, H);