diff --git a/prism/src/prism/ExplicitFilesRewardGenerator.java b/prism/src/prism/ExplicitFilesRewardGenerator.java
index 78ba8c86..1f2fcee3 100644
--- a/prism/src/prism/ExplicitFilesRewardGenerator.java
+++ b/prism/src/prism/ExplicitFilesRewardGenerator.java
@@ -121,7 +121,8 @@ public class ExplicitFilesRewardGenerator extends PrismComponent implements Rewa
 	@Override
 	public List<String> getRewardStructNames()
 	{
-		return Collections.singletonList("");
+		// Absence of a file implies no rewards
+		return stateRewardsFile == null ? Collections.emptyList() : Collections.singletonList("");
 	}
 	
 	@Override