diff --git a/types/n3/index.d.ts b/types/n3/index.d.ts
index 566de9f396..005af9f929 100644
--- a/types/n3/index.d.ts
+++ b/types/n3/index.d.ts
@@ -205,7 +205,7 @@ export interface StreamWriterConstructor {
 }
 export const StreamWriter: StreamWriterConstructor;
 
-export interface N3StreamWriter<Q extends RDF.BaseQuad = Quad> extends NodeJS.ReadWriteStream, RDF.Source<Q> {}
+export interface N3StreamWriter<Q extends RDF.BaseQuad = Quad> extends NodeJS.ReadWriteStream, RDF.Sink<Q> {}
 
 export interface N3Store<Q_RDF extends RDF.BaseQuad = RDF.Quad, Q_N3 extends BaseQuad = Quad> extends RDF.Store<Q_RDF> {
     readonly size: number;