diff --git a/prism/src/explicit/rewards/ConstructRewards.java b/prism/src/explicit/rewards/ConstructRewards.java
index e19e77a0..0ef9d089 100644
--- a/prism/src/explicit/rewards/ConstructRewards.java
+++ b/prism/src/explicit/rewards/ConstructRewards.java
@@ -230,6 +230,10 @@ public class ConstructRewards
 	 */
 	public MCRewards buildMCRewardStructure(DTMC mc, ModelGenerator modelGen, int r) throws PrismException
 	{
+		if (modelGen == null) {
+			throw new PrismException("No model generator to build reward structure");
+		}
+		
 		if (modelGen.rewardStructHasTransitionRewards(r)) {
 			// TODO
 			throw new PrismNotSupportedException("Explicit engine does not yet handle transition rewards for D/CTMCs");
diff --git a/prism/src/parser/ExplicitFiles2ModulesFile.java b/prism/src/parser/ExplicitFiles2ModulesFile.java
index 487fdc34..257cb741 100644
--- a/prism/src/parser/ExplicitFiles2ModulesFile.java
+++ b/prism/src/parser/ExplicitFiles2ModulesFile.java
@@ -43,6 +43,7 @@ import parser.ast.ExpressionLiteral;
 import parser.ast.LabelList;
 import parser.ast.Module;
 import parser.ast.ModulesFile;
+import parser.ast.RewardStruct;
 import parser.type.Type;
 import parser.type.TypeBool;
 import parser.type.TypeInt;
@@ -82,7 +83,7 @@ public class ExplicitFiles2ModulesFile extends PrismComponent
 	 * @param transFile transitions file
 	 * @param labelsFile labels file (may be {@code null})
 	 */
-	public ModulesFile buildModulesFile(File statesFile, File transFile, File labelsFile, ModelType typeOverride) throws PrismException
+	public ModulesFile buildModulesFile(File statesFile, File transFile, File labelsFile, File stateRewardsFile, ModelType typeOverride) throws PrismException
 	{
 		ModulesFile modulesFile;
 		ModelType modelType;
@@ -99,6 +100,11 @@ public class ExplicitFiles2ModulesFile extends PrismComponent
 		if (labelsFile != null) {
 			modulesFile.setLabelList(createLabelListFromLabelsFile(labelsFile));
 		}
+		
+		// Add a new (unnamed) reward structure if there is a state rewards file
+		if (stateRewardsFile != null) {
+			modulesFile.addRewardStruct(new RewardStruct());
+		}
 
 		// Set model type: if no preference stated, assume default of MDP
 		modelType = (typeOverride == null) ? ModelType.MDP : typeOverride;
diff --git a/prism/src/prism/Prism.java b/prism/src/prism/Prism.java
index cbc22327..48c63317 100644
--- a/prism/src/prism/Prism.java
+++ b/prism/src/prism/Prism.java
@@ -1862,7 +1862,7 @@ public class Prism extends PrismComponent implements PrismSettingsListener
 		clearBuiltModel();
 		// Construct ModulesFile
 		ExplicitFiles2ModulesFile ef2mf = new ExplicitFiles2ModulesFile(this);
-		currentModulesFile = ef2mf.buildModulesFile(statesFile, transFile, labelsFile, typeOverride);
+		currentModulesFile = ef2mf.buildModulesFile(statesFile, transFile, labelsFile, stateRewardsFile, typeOverride);
 		// Store explicit files info for later
 		explicitFilesStatesFile = statesFile;
 		explicitFilesTransFile = transFile;
@@ -2360,6 +2360,12 @@ public class Prism extends PrismComponent implements PrismSettingsListener
 		int numRewardStructs = currentModelInfo.getNumRewardStructs();
 		if (numRewardStructs == 0) {
 			mainLog.println("\nOmitting state reward export as there are no reward structures");
+			return;
+		}
+		
+		if (currentModelSource == ModelSource.EXPLICIT_FILES && getExplicit()) {
+			mainLog.println("\nOmitting state reward export (not supported when importing files using the explicit engine)");
+			return;
 		}
 		
 		// Rows format does not apply to vectors