diff -ruN canonical.orig/canonical.php canonical/canonical.php
--- canonical.orig/canonical.php	2009-03-11 14:37:08.000000000 -0500
+++ canonical/canonical.php	2009-09-10 15:32:16.000000000 -0500
@@ -117,6 +117,10 @@
 			$link = yoast_get_paged($link);
 			$link = trailingslashit($link);
         }
+    } elseif ($query->is_tax) {
+      $taxonomy = get_query_var( 'taxonomy' );
+      $term = get_query_var( 'term' );
+      $link = get_term_link($term, $taxonomy);
     } else {
         return false;
     }
@@ -144,4 +148,4 @@
 		return $link;
 }
 add_action('wp_head','yoast_canonical_link',10,1);
-?>
\ No newline at end of file
+?>