diff --git a/src/experimental/bauer_spiral.scad b/src/experimental/bauer_spiral.scad
index 719a1e14..155ba6fd 100644
--- a/src/experimental/bauer_spiral.scad
+++ b/src/experimental/bauer_spiral.scad
@@ -1,4 +1,4 @@
-function bauer_spiral(n, radius, dir = "CT_CLK") = 
+function bauer_spiral(n, radius = 1, dir = "CT_CLK") = 
     let(
         L = sqrt(n * PI),
         toRadians = PI / 180,