diff --git a/test/test_line3d.scad b/test/test_line3d.scad
index efb6093f..4f0cd236 100644
--- a/test/test_line3d.scad
+++ b/test/test_line3d.scad
@@ -4,10 +4,10 @@ include <line3d.scad>;
 module test_line3d_butt(p, r, frags, length, angles) {
     p1 = [0, 0, 0];
     p2 = [10, 2, 10];
-    thickness = 1;
+    diameter = 1;
     fn = 24;
     assertEqualPoint(p1, p);
-    assertEqualNum(thickness / 2, r);
+    assertEqualNum(diameter / 2, r);
     assertEqualNum(fn, frags);
     assertEqualNum(14.2829, length);
     assertEqualPoint([0, 45.5618, 11.3099], angles);
@@ -16,10 +16,10 @@ module test_line3d_butt(p, r, frags, length, angles) {
 module test_line3d_cap(p, r, frags, cap_leng, angles) {
     p1 = [0, 0, 0];
     p2 = [10, 2, 10];
-    thickness = 1;
+    diameter = 1;
     fn = 24;
     assert(p == p1 || p == p2);
-    assertEqualNum(thickness / 2, r);
+    assertEqualNum(diameter / 2, r);
     assertEqualNum(fn, frags); 
     assertEqualNum(0.3536, cap_leng);
     assertEqualPoint([0, 45.5618, 11.3099], angles);
@@ -28,7 +28,7 @@ module test_line3d_cap(p, r, frags, cap_leng, angles) {
 module test_line3d() {
     p1 = [0, 0, 0];
     p2 = [10, 2, 10];
-    thickness = 1;
+    diameter = 1;
     fn = 24;
 
     echo("==== test_line3d_default_caps ====");      
@@ -36,7 +36,7 @@ module test_line3d() {
     line3d(
         p1 = p1, 
         p2 = p2, 
-        thickness = thickness,
+        diameter = diameter,
         $fn = fn
     );       
 }