diff --git a/Hadrons/EigenPack.hpp b/Hadrons/EigenPack.hpp
index 5388851d..4c122a37 100644
--- a/Hadrons/EigenPack.hpp
+++ b/Hadrons/EigenPack.hpp
@@ -228,7 +228,8 @@ template <typename F, typename FIo = F>
 class EigenPack
 {
 public:
-    typedef F Field;
+    typedef F   Field;
+    typedef FIo FieldIo;
 public:
     std::vector<RealD> eval;
     std::vector<F>     evec;
diff --git a/Hadrons/Modules/MIO/LoadEigenPack.cc b/Hadrons/Modules/MIO/LoadEigenPack.cc
index 7da4e14a..f0ae63c3 100644
--- a/Hadrons/Modules/MIO/LoadEigenPack.cc
+++ b/Hadrons/Modules/MIO/LoadEigenPack.cc
@@ -32,4 +32,4 @@ using namespace Hadrons;
 using namespace MIO;
 
 template class Grid::Hadrons::MIO::TLoadEigenPack<FermionEigenPack<FIMPL>>;
-
+template class Grid::Hadrons::MIO::TLoadEigenPack<FermionEigenPack<FIMPL, FIMPLF>>;
diff --git a/Hadrons/Modules/MIO/LoadEigenPack.hpp b/Hadrons/Modules/MIO/LoadEigenPack.hpp
index 83ef1d0c..330d35ad 100644
--- a/Hadrons/Modules/MIO/LoadEigenPack.hpp
+++ b/Hadrons/Modules/MIO/LoadEigenPack.hpp
@@ -54,7 +54,7 @@ template <typename Pack>
 class TLoadEigenPack: public Module<LoadEigenPackPar>
 {
 public:
-    typedef EigenPack<typename Pack::Field> BasePack;
+    typedef EigenPack<typename Pack::Field, typename Pack::FieldIo> BasePack;
 public:
     // constructor
     TLoadEigenPack(const std::string name);
@@ -70,6 +70,7 @@ public:
 };
 
 MODULE_REGISTER_TMP(LoadFermionEigenPack, TLoadEigenPack<FermionEigenPack<FIMPL>>, MIO);
+MODULE_REGISTER_TMP(LoadFermionEigenPackIo32, ARG(TLoadEigenPack<FermionEigenPack<FIMPL, FIMPLF>>), MIO);
 
 /******************************************************************************
  *                    TLoadEigenPack implementation                           *