diff --git a/opengl_test35.cpp b/opengl_test35.cpp
index 4cd3abe..03beece 100644
--- a/opengl_test35.cpp
+++ b/opengl_test35.cpp
@@ -92,7 +92,9 @@ int main(int argc, char** argv)
     Model kniedeModel("../resources/objects/kniede/kniede.obj");
 
     Shader backpackShader("9.2.geometry_shader.vert", "9.2.geometry_shader.frag");
+    stbi_set_flip_vertically_on_load(true);
     Model backpackModel("../resources/objects/backpack/backpack.obj");
+    stbi_set_flip_vertically_on_load(false);
 
     // set up vertex data (and buffer(s)) and configure vertex attributes
     // ------------------------------------------------------------------