No more Cloneable
diff --git a/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableParserConfig.java b/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableParserConfig.java
index b38a9f8..c7c1622 100644
--- a/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableParserConfig.java
+++ b/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableParserConfig.java
@@ -25,7 +25,7 @@
 import org.apache.commons.rdf.api.RDF;
 import org.apache.commons.rdf.api.RDFSyntax;
 
-final class MutableParserConfig implements Cloneable, Serializable, ParserConfig {
+final class MutableParserConfig implements Serializable, ParserConfig {
 	private static final long serialVersionUID = 1L;
 	private RDF rdf = null;
 	private RDFSyntax syntax = null;
@@ -49,11 +49,6 @@
 	}
 
 	@Override
-	protected Object clone() {
-		return new MutableParserConfig(this);
-	}
-
-	@Override
 	public Optional<ParserSource> source() {
 		return Optional.ofNullable(source);
 	}
diff --git a/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableWriterConfig.java b/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableWriterConfig.java
index 96df0ee..1fe72be 100644
--- a/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableWriterConfig.java
+++ b/commons-rdf-api/src/main/java/org/apache/commons/rdf/api/io/MutableWriterConfig.java
@@ -24,7 +24,7 @@
 import org.apache.commons.rdf.api.RDF;
 import org.apache.commons.rdf.api.RDFSyntax;
 
-final class MutableWriterConfig implements Cloneable, Serializable, WriterConfig {
+final class MutableWriterConfig implements Serializable, WriterConfig {
 	private static final long serialVersionUID = 1L;
 	private RDF rdf = null;
 	private RDFSyntax syntax = null;
@@ -45,11 +45,6 @@
 	}
 
 	@Override
-	protected Object clone() {
-		return new MutableWriterConfig(this);
-	}
-
-	@Override
 	public Optional<WriterSource> source() {
 		return Optional.ofNullable(source);
 	}