diff --git a/source/adios2/core/IO.cpp b/source/adios2/core/IO.cpp
index b0c87b4a5e..7255dc657d 100644
--- a/source/adios2/core/IO.cpp
+++ b/source/adios2/core/IO.cpp
@@ -574,6 +574,10 @@ Engine &IO::Open(const std::string &name, const Mode mode, helper::Comm comm)
                 engineTypeLC = "bp";
                 engineTypeLC.push_back(v);
             }
+            else if (adios2sys::SystemTools::FileIsDirectory(name + ".tier0"))
+            {
+                engineTypeLC = "mhs";
+            }
             else
             {
                 if (helper::EndsWith(name, ".bp", false))
diff --git a/source/adios2/engine/mhs/MhsReader.cpp b/source/adios2/engine/mhs/MhsReader.cpp
index dbea352876..996fbd4fa1 100644
--- a/source/adios2/engine/mhs/MhsReader.cpp
+++ b/source/adios2/engine/mhs/MhsReader.cpp
@@ -22,7 +22,7 @@ MhsReader::MhsReader(IO &io, const std::string &name, const Mode mode,
 : Engine("MhsReader", io, name, mode, std::move(comm))
 {
     helper::GetParameter(io.m_Parameters, "Tiers", m_Tiers);
-    Params params = {{"tiers", std::to_string(m_Tiers)}};
+    Params params = {{"Tiers", std::to_string(m_Tiers)}};
     m_SiriusCompressor = std::make_shared<compress::CompressSirius>(params);
     io.SetEngine("");
     m_SubIOs.emplace_back(&io);