diff --git a/mini-tube.scad b/mini-tube.scad
index 10a9cd4..c281d5d 100644
--- a/mini-tube.scad
+++ b/mini-tube.scad
@@ -47,6 +47,7 @@ difference() {
 	square([mark_depth_mm + 1, mark_width_mm]);
 
 	// text
+	if (text_size_mm > 0)
 	translate([0, 0, text_z_mm])
 	difference() {
 		rotate([0, 0, -90])