diff --git a/include/boost/numeric/ublas/matrix.hpp b/include/boost/numeric/ublas/matrix.hpp
index 03c95a45..a8f8ab39 100644
--- a/include/boost/numeric/ublas/matrix.hpp
+++ b/include/boost/numeric/ublas/matrix.hpp
@@ -17,6 +17,7 @@
 #ifndef BOOST_UBLAS_MATRIX_H
 #define BOOST_UBLAS_MATRIX_H
 
+#include <boost/numeric/ublas//matrix_expression.hpp>
 #include <boost/numeric/ublas/vector.hpp>
 #include <boost/numeric/ublas/detail/matrix_assign.hpp>