diff --git a/include/boost/numeric/ublas/symmetric.hpp b/include/boost/numeric/ublas/symmetric.hpp
index ef31e122..0ebbe639 100644
--- a/include/boost/numeric/ublas/symmetric.hpp
+++ b/include/boost/numeric/ublas/symmetric.hpp
@@ -14,6 +14,7 @@
 #define _BOOST_UBLAS_SYMMETRIC_
 
 #include <boost/numeric/ublas/matrix.hpp>
+#include <boost/numeric/ublas/triangular.hpp>
 #include <boost/numeric/ublas/detail/temporary.hpp>
 
 // Iterators based on ideas of Jeremy Siek
@@ -121,7 +122,7 @@ namespace boost { namespace numeric { namespace ublas {
         void resize (size_type size, bool preserve = true) {
             if (preserve) {
                 self_type temporary (size, size);
-                detail::matrix_resize_preserve<layout_type> (*this, temporary);
+                detail::matrix_resize_preserve<layout_type, triangular_type> (*this, temporary);
             }
             else {
                 data ().resize (triangular_type::packed_size (layout_type (), size, size));