diff --git a/examples/turtle/lsystem2_collection.scad b/examples/turtle/lsystem2_collection.scad
index 6fec3e70..fd2fc0c8 100644
--- a/examples/turtle/lsystem2_collection.scad
+++ b/examples/turtle/lsystem2_collection.scad
@@ -1,7 +1,8 @@
 use <turtle/lsystem2.scad>;
+use <util/dedup.scad>;
 use <line2d.scad>;
 
-for(line = fern()) {
+for(line = dedup(fern())) {
     line2d(
         line[0],
         line[1],
diff --git a/examples/turtle/lsystem3_collection.scad b/examples/turtle/lsystem3_collection.scad
index 11093f45..8ae1b243 100644
--- a/examples/turtle/lsystem3_collection.scad
+++ b/examples/turtle/lsystem3_collection.scad
@@ -1,7 +1,8 @@
 use <turtle/lsystem3.scad>;
+use <util/dedup.scad>;
 use <hull_polyline3d.scad>;
 
-for(line = hilbert_curve()) {
+for(line = dedup(hilbert_curve())) {
     hull_polyline3d(
         [line[0], line[1]], 
         diameter = 0.5,