diff --git a/src/Mass/Mass.cpp b/src/Mass/Mass.cpp
index 905ea3d..7df01e8 100644
--- a/src/Mass/Mass.cpp
+++ b/src/Mass/Mass.cpp
@@ -98,13 +98,13 @@ void Mass::refreshValues() {
         }
     }
 
-    auto unit_data = _mass->at<GenericStructProperty>("UnitData");
+    auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
         _state = State::Invalid;
         return;
     }
 
-    auto name_prop = unit_data->at<StringProperty>("Name_45_A037C5D54E53456407BDF091344529BB");
+    auto name_prop = unit_data->at<StringProperty>("Name_45_A037C5D54E53456407BDF091344529BB"_s);
 
     if(!name_prop) {
         _name = Containers::NullOpt;
@@ -184,7 +184,7 @@ void Mass::refreshValues() {
         return;
     }
 
-    auto account_prop = _mass->at<StringProperty>("Account");
+    auto account_prop = _mass->at<StringProperty>("Account"_s);
     if(!account_prop) {
         _state = State::Invalid;
         return;