diff --git a/common.scad b/common.scad
index 4ca337e..d1d4021 100644
--- a/common.scad
+++ b/common.scad
@@ -282,7 +282,7 @@ function get_anchor(anchor,center,uncentered=BOT,dflt=CENTER) =
 //   r = Most general radius.
 //   d = Most general diameter.
 //   dflt = Value to return if all other values given are `undef`.
-function get_radius(r1=undef, r2=undef, r=undef, d1=undef, d2=undef, d=undef, dflt=undef) = 
+function get_radius(r1, r2, r, d1, d2, d, dflt) = 
     assert(num_defined([r1,d1,r2,d2])<2, "Conflicting or redundant radius/diameter arguments given.")
     !is_undef(r1) ?   assert(is_finite(r1), "Invalid radius r1." ) r1 
     : !is_undef(r2) ? assert(is_finite(r2), "Invalid radius r2." ) r2
diff --git a/shapes.scad b/shapes.scad
index 0c63a81..5b8c975 100644
--- a/shapes.scad
+++ b/shapes.scad
@@ -795,13 +795,13 @@ module xcyl(l=undef, r=undef, d=undef, r1=undef, r2=undef, d1=undef, d2=undef, h
 //       ycyl(l=35, d=20);
 //       ycyl(l=35, d1=30, d2=10);
 //   }
-module ycyl(l=undef, r=undef, d=undef, r1=undef, r2=undef, d1=undef, d2=undef, h=undef, anchor=CENTER)
+module ycyl(l, r, d, r1, r2, d1, d2, h, anchor=CENTER)
 {
     r1 = get_radius(r1=r1, r=r, d1=d1, d=d, dflt=1);
     r2 = get_radius(r1=r2, r=r, d1=d2, d=d, dflt=1);
     l = first_defined([l, h, 1]);
     attachable(anchor,0,UP, r1=r1, r2=r2, l=l, axis=BACK) {
-        cyl(l=l, h=h, r=r, r1=r1, r2=r2, d=d, d1=d1, d2=d2, orient=BACK, anchor=CENTER);
+        cyl(l=l, h=h, r1=r1, r2=r2, orient=BACK, anchor=CENTER);
         children();
     }
 }
diff --git a/version.scad b/version.scad
index 526844e..89e02f4 100644
--- a/version.scad
+++ b/version.scad
@@ -8,7 +8,7 @@
 //////////////////////////////////////////////////////////////////////
 
 
-BOSL_VERSION = [2,0,478];
+BOSL_VERSION = [2,0,479];
 
 
 // Section: BOSL Library Version Functions