diff --git a/interfaces/matlab/toolbox/@ThermoPhase/setState_satLiquid.m b/interfaces/matlab/toolbox/@ThermoPhase/setState_satLiquid.m
index 5afb29c91..5c617f137 100644
--- a/interfaces/matlab/toolbox/@ThermoPhase/setState_satLiquid.m
+++ b/interfaces/matlab/toolbox/@ThermoPhase/setState_satLiquid.m
@@ -6,4 +6,4 @@ function setState_satLiquid(tp)
 %     class derived from ThermoPhase)
 %
 
-thermo_set(tp.tp_id, 2, 0);
+set(tp, 'T', temperature(tp), 'Liquid', 1.0)
diff --git a/interfaces/matlab/toolbox/@ThermoPhase/setState_satVapor.m b/interfaces/matlab/toolbox/@ThermoPhase/setState_satVapor.m
index 3e0bf9ad2..6805e1e17 100644
--- a/interfaces/matlab/toolbox/@ThermoPhase/setState_satVapor.m
+++ b/interfaces/matlab/toolbox/@ThermoPhase/setState_satVapor.m
@@ -6,4 +6,4 @@ function setState_satVapor(tp)
 %     class derived from ThermoPhase)
 %
 
-thermo_set(tp.tp_id, 3, 0);
+set(tp, 'T', temperature(tp), 'Vapor', 1.0)