diff --git a/app/envelope-box.c b/app/envelope-box.c
index 8c1b1ee..481f99b 100644
--- a/app/envelope-box.c
+++ b/app/envelope-box.c
@@ -1055,8 +1055,10 @@ void envelope_box_set_envelope(EnvelopeBox* e, STEnvelope* env)
     gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(e->sustain), env->flags & EF_SUSTAIN);
     gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(e->loop), env->flags & EF_LOOP);
 
+#ifdef USE_CANVAS
     update_sustain_line(e);
     update_loop_lines(e);
+#endif
 
     gtk_spin_button_set_value(GTK_SPIN_BUTTON(e->spin_length), env->num_points);