diff --git a/prism/src/explicit/StateValues.java b/prism/src/explicit/StateValues.java
index 4cb60de5..f936d72d 100644
--- a/prism/src/explicit/StateValues.java
+++ b/prism/src/explicit/StateValues.java
@@ -468,6 +468,18 @@ public class StateValues implements StateVector
 		valuesB.and(sv.valuesB);
 	}
 
+	/**
+	 * Complement the (boolean) vector.
+	 */
+	public void complement() throws PrismException
+	{
+		if (!(type instanceof TypeBool)) {
+			throw new PrismException("Can only complement Boolean vectors");
+		}
+
+		valuesB.flip(0, size);
+	}
+	
 	/**
 	 * Modify the vector by applying 'equals' with operand {@code sv}.
 	 */