diff --git a/samples/matlab/periodic_cstr.m b/samples/matlab/periodic_cstr.m
index 0aa766ab7..bffbf45c0 100644
--- a/samples/matlab/periodic_cstr.m
+++ b/samples/matlab/periodic_cstr.m
@@ -45,7 +45,7 @@ upstream = Reservoir(gas);
 % Now set the gas to the initial temperature of the reactor, and create
 % the reactor object.
 set(gas, 'T', t, 'P', p);
-cstr = Reactor(gas);
+cstr = IdealGasReactor(gas);
 
 % Set its volume to 10 cm^3. In this problem, the reactor volume is
 % fixed, so the initial volume is the volume at all later times.
diff --git a/samples/matlab/reactor1.m b/samples/matlab/reactor1.m
index 26a2a958c..90b61994e 100644
--- a/samples/matlab/reactor1.m
+++ b/samples/matlab/reactor1.m
@@ -25,7 +25,7 @@ P = oneatm
 set(gas,'T',1001.0,'P',P,'X','H2:2,O2:1,N2:4');
 
 % create a reactor, and insert the gas
-r = Reactor(gas);
+r = IdealGasReactor(gas);
 
 % create a reservoir to represent the environment
 a = IdealGasMix('air.cti');
diff --git a/samples/matlab/reactor2.m b/samples/matlab/reactor2.m
index 52c21ff14..a0627e9b5 100644
--- a/samples/matlab/reactor2.m
+++ b/samples/matlab/reactor2.m
@@ -20,7 +20,7 @@ nsp = nSpecies(gas);
 set(gas,'T',1001.0,'P',oneatm,'X','H2:2,O2:1,N2:4');
 
 % create a reactor, and insert the gas
-r = Reactor(gas);
+r = IdealGasReactor(gas);
 
 % create a reactor network and insert the reactor
 network = ReactorNet({r});
diff --git a/samples/matlab/surfreactor.m b/samples/matlab/surfreactor.m
index 160019504..33018eeac 100644
--- a/samples/matlab/surfreactor.m
+++ b/samples/matlab/surfreactor.m
@@ -21,7 +21,7 @@ setTemperature(surf, t);
 nsp = nSpecies(gas);
 
 % create a reactor, and insert the gas
-r = Reactor(gas);
+r = IdealGasReactor(gas);
 setInitialVolume(r, 1.0e-6)
 
 % create a reservoir to represent the environment