diff --git a/prism/src/jdd/JDDVars.java b/prism/src/jdd/JDDVars.java
index 37a0d559..e6a86ef1 100644
--- a/prism/src/jdd/JDDVars.java
+++ b/prism/src/jdd/JDDVars.java
@@ -229,6 +229,16 @@ public class JDDVars implements Iterable<JDDNode>
 		}
 	}
 
+	/**
+	 * Calls derefAll on all JDDVars elements of a JDDVars[] array.
+	 */
+	public static void derefAllArray(JDDVars[] vars)
+	{
+		for (JDDVars v : vars) {
+			v.derefAll();
+		}
+	}
+
 	/**
 	 * Constructs a JNI array for the stored variables
 	 * that can be passed to the C-based functions.