diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index dbcf0e60de..fbb5ba6944 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1845,7 +1845,7 @@ void GLCanvas3D::reload_scene(bool refresh_immediately, bool force_full_scene_re
                 volume->is_modifier = !mvs->model_volume->is_model_part();
                 volume->set_color(color_from_model_volume(*mvs->model_volume));
                 // force update of render_color alpha channel 
-                bool transparent = volume->color[3] < 1.0f;
+                bool transparent = volume->color.is_transparent();
                 if (transparent)
                     volume->force_transparent = true;
                 volume->set_render_color();