diff --git a/include/boost/numeric/ublas/detail/matrix_assign.hpp b/include/boost/numeric/ublas/detail/matrix_assign.hpp
index c49851c7..e85b8c11 100644
--- a/include/boost/numeric/ublas/detail/matrix_assign.hpp
+++ b/include/boost/numeric/ublas/detail/matrix_assign.hpp
@@ -17,6 +17,9 @@
 #ifndef BOOST_UBLAS_MATRIX_ASSIGN_H
 #define BOOST_UBLAS_MATRIX_ASSIGN_H
 
+// Required for make_conformant storage
+#include <vector>
+
 // Iterators based on ideas of Jeremy Siek
 
 namespace boost { namespace numeric { namespace ublas {