diff --git a/src/obj.c b/src/obj.c
index 049a80d..d26fb61 100644
--- a/src/obj.c
+++ b/src/obj.c
@@ -347,8 +347,7 @@ internal void fill_triangle(Render *render, V3f vertices[TRIANGLE_VERTICES],
       }
 
       z = 0.0f;
-      z += vertices[0].z * coords.x + vertices[1].z * coords.y +
-           vertices[2].z * coords.z;
+      z += v0.z * coords.x + v1.z * coords.y + v2.z * coords.z;
       zbuf = get_pixel(f32, &(render->depth), x, y);
 
       if (z > zbuf) {