diff --git a/prism/src/prism/Prism.java b/prism/src/prism/Prism.java
index bd9a1e15..5f7b4d43 100644
--- a/prism/src/prism/Prism.java
+++ b/prism/src/prism/Prism.java
@@ -1451,7 +1451,7 @@ public class Prism implements PrismSettingsListener
 	
 	public void modelCheckSimulatorExperiment(ModulesFile modulesFile, PropertiesFile propertiesFile, UndefinedConstants undefinedConstants, ResultsCollection results, Expression propertyToCheck, Values initialState, int noIterations, int pathLength) throws PrismException, InterruptedException
 	{
-		getSimulator().modelCheckExperiment(modulesFile, propertiesFile, undefinedConstants, results, propertyToCheck, initialState, pathLength, noIterations);
+		getSimulator().modelCheckExperiment(modulesFile, propertiesFile, undefinedConstants, results, propertyToCheck, new State(initialState), pathLength, noIterations);
 	}
 	
 	// generate a random path through the model using the simulator
diff --git a/prism/src/simulator/GenerateSimulationPath.java b/prism/src/simulator/GenerateSimulationPath.java
index 2fcda764..cdd65778 100644
--- a/prism/src/simulator/GenerateSimulationPath.java
+++ b/prism/src/simulator/GenerateSimulationPath.java
@@ -29,9 +29,9 @@ package simulator;
 import java.io.File;
 import java.util.ArrayList;
 
-import parser.Values;
-import parser.ast.ModulesFile;
 import prism.*;
+import parser.*;
+import parser.ast.*;
 
 public class GenerateSimulationPath
 {
@@ -220,7 +220,7 @@ public class GenerateSimulationPath
 		// generate path
 		engine.createNewPath(modulesFile);
 		for (j = 0; j < simPathRepeat; j++) {
-			engine.initialisePath(initialState);
+			engine.initialisePath(new State(initialState));
 			i = 0;
 			t = 0.0;
 			done = false;
diff --git a/prism/src/simulator/SimulatorEngine.java b/prism/src/simulator/SimulatorEngine.java
index 1beda04c..8ca9d724 100644
--- a/prism/src/simulator/SimulatorEngine.java
+++ b/prism/src/simulator/SimulatorEngine.java
@@ -268,16 +268,6 @@ public class SimulatorEngine
 		onTheFly = true;
 	}
 
-	/**
-	 * Initialise (or re-initialise) the simulation path, starting with a specific (or random) initial state.
-	 * @param initialState Initial state (if null, is selected randomly)
-	 */
-	public void initialisePath(Values initialState) throws PrismException
-	{
-		// TODO: need this method?
-		initialisePath(new State(initialState));
-	}
-
 	/**
 	 * Initialise (or re-initialise) the simulation path, starting with a specific (or random) initial state.
 	 * @param initialState Initial state (if null, is selected randomly)
@@ -290,8 +280,6 @@ public class SimulatorEngine
 		}
 		// Or pick a random one
 		else {
-			// TODO
-			//currentState...
 			throw new PrismException("Random initial start state not yet supported");
 		}
 		updater.calculateStateRewards(currentState, currentStateRewards);
@@ -1377,7 +1365,7 @@ public class SimulatorEngine
 	 *             if something goes wrong with the sampling algorithm
 	 */
 	public void modelCheckExperiment(ModulesFile modulesFile, PropertiesFile propertiesFile, UndefinedConstants undefinedConstants,
-			ResultsCollection resultsCollection, Expression propertyToCheck, Values initialState, int maxPathLength, int noIterations) throws PrismException,
+			ResultsCollection resultsCollection, Expression propertyToCheck, State initialState, int maxPathLength, int noIterations) throws PrismException,
 			InterruptedException, PrismException
 	{
 		int n;
diff --git a/prism/src/userinterface/simulator/GUISimulator.java b/prism/src/userinterface/simulator/GUISimulator.java
index a45bfee7..001894e3 100644
--- a/prism/src/userinterface/simulator/GUISimulator.java
+++ b/prism/src/userinterface/simulator/GUISimulator.java
@@ -360,7 +360,7 @@ public class GUISimulator extends GUIPlugin implements MouseListener, ListSelect
 			engine.createNewPath(parsedModel);
 			pathActive = true;
 			repopulateFormulae(pf);
-			engine.initialisePath(initialState);
+			engine.initialisePath(new State(initialState));
 
 			totalTimeLabel.setText(formatDouble(engine.getTotalTimeForPath()));
 			pathLengthLabel.setText("" + engine.getPathSize());