diff --git a/regions.scad b/regions.scad
index 8923751..acd66d9 100644
--- a/regions.scad
+++ b/regions.scad
@@ -20,8 +20,7 @@
 //   is_region(x);
 // Description:
 //   Returns true if the given item looks like a region.  A region is defined as a list of zero or more paths.
-function is_region(x) =
-  is_list(x) && all([for(y=x) is_path(y, len(x[0][0]))]);
+function is_region(x) = is_list(x) && is_path(x.x);
 
 
 // Function: close_region()