diff --git a/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/ExternalSet.java b/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/ExternalSet.java
index b79e6217c..becd874f7 100644
--- a/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/ExternalSet.java
+++ b/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/ExternalSet.java
@@ -19,7 +19,10 @@
 
 /**
  * @author James Leigh
+ * 
+ * @deprecated since 3.0.
  */
+@Deprecated
 public abstract class ExternalSet extends AbstractQueryModelNode implements TupleExpr {
 
 	private static final long serialVersionUID = 3903453394409442226L;