diff --git a/src/lime_types.h b/src/lime_types.h
index da1deed..85a546a 100644
--- a/src/lime_types.h
+++ b/src/lime_types.h
@@ -1,7 +1,7 @@
 #include <RcppEigen.h>
 
 // definition of types in a separate header so it is included in the RcppExports.cpp file.
-typedef Eigen::MappedSparseMatrix<double> MSpMat;
+typedef Eigen::Map<Eigen::SparseMatrix<double>> MSpMat;
 typedef MSpMat::InnerIterator InIterMat;
 typedef Eigen::SparseVector<double> SpVec;
 typedef SpVec::InnerIterator InIterVec;