diff --git a/include/boost/numeric/ublas/lu.hpp b/include/boost/numeric/ublas/lu.hpp
index a24037b8..a1b56658 100644
--- a/include/boost/numeric/ublas/lu.hpp
+++ b/include/boost/numeric/ublas/lu.hpp
@@ -95,7 +95,7 @@ namespace boost { namespace numeric { namespace ublas {
 #if BOOST_UBLAS_TYPE_CHECK
         matrix_type cm (m);
 #endif
-        int singular = 0;
+        size_type singular = 0;
         size_type size1 = m.size1 ();
         size_type size2 = m.size2 ();
         size_type size = (std::min) (size1, size2);
@@ -131,7 +131,7 @@ namespace boost { namespace numeric { namespace ublas {
 #if BOOST_UBLAS_TYPE_CHECK
         matrix_type cm (m);
 #endif
-        int singular = 0;
+        size_type singular = 0;
         size_type size1 = m.size1 ();
         size_type size2 = m.size2 ();
         size_type size = (std::min) (size1, size2);
@@ -175,7 +175,7 @@ namespace boost { namespace numeric { namespace ublas {
 #if BOOST_UBLAS_TYPE_CHECK
         matrix_type cm (m);
 #endif
-        int singular = 0;
+        size_type singular = 0;
         size_type size1 = m.size1 ();
         size_type size2 = m.size2 ();
         size_type size = (std::min) (size1, size2);