diff --git a/jena-core/src/main/java/org/apache/jena/rdf/model/Model.java b/jena-core/src/main/java/org/apache/jena/rdf/model/Model.java
index a7ef62574ed..924256d4cff 100644
--- a/jena-core/src/main/java/org/apache/jena/rdf/model/Model.java
+++ b/jena-core/src/main/java/org/apache/jena/rdf/model/Model.java
@@ -1053,10 +1053,10 @@ Remove all the statements matching (s, p, o) from this model.
     public boolean isClosed();
 
     // Override return type for methods inherited from PrefixMapping
-	Model setNsPrefix( String prefix, String uri );
-	Model removeNsPrefix( String prefix );
-	Model clearNsPrefixMap();
-	Model setNsPrefixes( PrefixMapping other );
-	Model setNsPrefixes( Map<String, String> map );
-	Model withDefaultMappings( PrefixMapping map );
+	@Override Model setNsPrefix( String prefix, String uri );
+	@Override Model removeNsPrefix( String prefix );
+	@Override Model clearNsPrefixMap();
+	@Override Model setNsPrefixes( PrefixMapping other );
+	@Override Model setNsPrefixes( Map<String, String> map );
+	@Override Model withDefaultMappings( PrefixMapping map );
 }
diff --git a/jena-permissions/src/main/java/org/apache/jena/permissions/model/SecuredModel.java b/jena-permissions/src/main/java/org/apache/jena/permissions/model/SecuredModel.java
index ba960734e9b..43d1685d391 100644
--- a/jena-permissions/src/main/java/org/apache/jena/permissions/model/SecuredModel.java
+++ b/jena-permissions/src/main/java/org/apache/jena/permissions/model/SecuredModel.java
@@ -1894,9 +1894,9 @@ public SecuredModel write(final Writer writer, final String lang, final String b
 			throws ReadDeniedException, AuthenticationRequiredException;
 
 	// Override return type for methods inherited from PrefixMapping
-	SecuredModel setNsPrefix( String prefix, String uri );
-	SecuredModel clearNsPrefixMap();
-	SecuredModel setNsPrefixes( PrefixMapping other );
-	SecuredModel setNsPrefixes( Map<String, String> map );
-	SecuredModel withDefaultMappings( PrefixMapping map );
+	@Override SecuredModel setNsPrefix( String prefix, String uri );
+	@Override SecuredModel clearNsPrefixMap();
+	@Override SecuredModel setNsPrefixes( PrefixMapping other );
+	@Override SecuredModel setNsPrefixes( Map<String, String> map );
+	@Override SecuredModel withDefaultMappings( PrefixMapping map );
 }