diff --git a/extensions/openpower-pels/mtms.cpp b/extensions/openpower-pels/mtms.cpp
index 355431f..ec964f2 100644
--- a/extensions/openpower-pels/mtms.cpp
+++ b/extensions/openpower-pels/mtms.cpp
@@ -51,12 +51,12 @@
 {
     for (size_t i = 0; i < MTMS::mtmSize; i++)
     {
-        s << mtms.machineTypeAndModel()[i];
+        s << mtms.machineTypeAndModelRaw()[i];
     }
 
     for (size_t i = 0; i < MTMS::snSize; i++)
     {
-        s << mtms.machineSerialNumber()[i];
+        s << mtms.machineSerialNumberRaw()[i];
     }
 
     return s;
@@ -66,12 +66,12 @@
 {
     for (size_t i = 0; i < MTMS::mtmSize; i++)
     {
-        s >> mtms.machineTypeAndModel()[i];
+        s >> mtms.machineTypeAndModelRaw()[i];
     }
 
     for (size_t i = 0; i < MTMS::snSize; i++)
     {
-        s >> mtms.machineSerialNumber()[i];
+        s >> mtms.machineSerialNumberRaw()[i];
     }
 
     return s;