diff --git a/src/experimental/_impl/_lsystem2_impl.scad b/src/experimental/_impl/_lsystem2_impl.scad
index 6fb0dcaf..d6b3c860 100644
--- a/src/experimental/_impl/_lsystem2_impl.scad
+++ b/src/experimental/_impl/_lsystem2_impl.scad
@@ -1,6 +1,8 @@
 use <experimental/_impl/_lsystem_comm.scad>;
 use <turtle/turtle2d.scad>;
-    
+
+function _lsystem2_join(str_lt) = _join(str_lt);
+
 function _lsystem2_derive(axiom, rules, n, rules_pr) =
     is_undef(rules_pr) ? _derive(axiom, rules, n) :
                          _derive_p(axiom, rules, rules_pr, n);
diff --git a/src/experimental/_impl/_lsystem3_impl.scad b/src/experimental/_impl/_lsystem3_impl.scad
index e99f3a54..8c74038c 100644
--- a/src/experimental/_impl/_lsystem3_impl.scad
+++ b/src/experimental/_impl/_lsystem3_impl.scad
@@ -1,6 +1,8 @@
 use <experimental/_impl/_lsystem_comm.scad>;
 use <turtle/turtle3d.scad>;
-    
+
+function _lsystem3_join(str_lt) = _join(str_lt);
+
 function _lsystem3_derive(axiom, rules, n, rules_pr) =
     is_undef(rules_pr) ? _derive(axiom, rules, n) :
                          _derive_p(axiom, rules, rules_pr, n);
diff --git a/src/experimental/lsystem2.scad b/src/experimental/lsystem2.scad
index 37265ab0..a8b38537 100644
--- a/src/experimental/lsystem2.scad
+++ b/src/experimental/lsystem2.scad
@@ -16,7 +16,7 @@ use <turtle/turtle2d.scad>;
 function lsystem2(axiom, rules, n, angle, leng = 1, heading = 0, start = [0, 0], forward_chars = "F", rules_pr) =
     let(
         derived = _lsystem2_derive(axiom, rules, n, rules_pr),
-        codes = forward_chars == "F" ? derived : _join([
+        codes = forward_chars == "F" ? derived : _lsystem2_join([
             for(c = derived)
             let(idx = search(c, forward_chars))
             idx == [] ? c : "F"
diff --git a/src/experimental/lsystem3.scad b/src/experimental/lsystem3.scad
index 2da9ade8..eb12cbe1 100644
--- a/src/experimental/lsystem3.scad
+++ b/src/experimental/lsystem3.scad
@@ -20,7 +20,7 @@ use <turtle/turtle3d.scad>;
 function lsystem3(axiom, rules, n, angle, leng = 1, heading = 0, start = [0, 0, 0], forward_chars = "F", rules_pr) =
     let(
         derived = _lsystem3_derive(axiom, rules, n, rules_pr),
-        codes = forward_chars == "F" ? derived : _join([
+        codes = forward_chars == "F" ? derived : _lsystem3_join([
             for(c = derived)
             let(idx = search(c, forward_chars))
             idx == [] ? c : "F"