--- triangular.hpp.original	2012-09-18 14:07:06.000000000 -0700
+++ triangular.hpp	2013-02-13 14:20:00.562000000 -0800
@@ -2162,7 +2162,7 @@
                 singular ().raise ();
 #endif
             value_type t = e2 () (n);
-            for (difference_type m = n + 1; m < e1 ().size2(); ++ m) {
+            for (difference_type m = n + 1; m < static_cast<difference_type>(e1 ().size2()); ++ m) {
               t -= e1 () (n, m)  * e2 () (m);
             }
             e2() (n) = t / e1 () (n, n);