diff --git a/prism/src/jltl2ba/APSet.java b/prism/src/jltl2ba/APSet.java
index a12791f3..d600c1c9 100644
--- a/prism/src/jltl2ba/APSet.java
+++ b/prism/src/jltl2ba/APSet.java
@@ -22,6 +22,8 @@
 
 package jltl2ba;
 
+import java.util.Collections;
+import java.util.List;
 import java.util.Vector;
 import java.util.Iterator;
 import java.io.PrintStream;
@@ -83,6 +85,15 @@ public class APSet implements Iterable<String>
 		return vector.contains(s);
 	}
 
+	/**
+	 * Returns an (unmodifiable) List view of this AP set.
+	 * To modify this APSet, use the {@code addAP} method.
+	 */
+	public List<String> asList()
+	{
+		return Collections.unmodifiableList(vector);
+	}
+
 	/**
 	 * Get the size of this set
 	 * @return the number of APs in this set.