diff --git a/types/n3/index.d.ts b/types/n3/index.d.ts
index eb52abd041..6e0a8bee54 100644
--- a/types/n3/index.d.ts
+++ b/types/n3/index.d.ts
@@ -170,7 +170,7 @@ export class Writer<Q extends RDF.BaseQuad = RDF.Quad> {
     list(triple: Array<Q['object']>): Quad_Object[];
 }
 
-export class StreamWriter<Q extends RDF.BaseQuad = Quad> extends stream.Transform implements RDF.Sink<RDF.Stream<Q>, EventEmitter> {
+export class StreamWriter<Q extends RDF.BaseQuad = RDF.Quad> extends stream.Transform implements RDF.Sink<RDF.Stream<Q>, EventEmitter> {
   constructor(options?: WriterOptions);
   constructor(fd: any, options?: WriterOptions);
   import(stream: RDF.Stream<Q>): EventEmitter;
diff --git a/types/n3/n3-tests.ts b/types/n3/n3-tests.ts
index 5f4945f101..26e88cb39a 100644
--- a/types/n3/n3-tests.ts
+++ b/types/n3/n3-tests.ts
@@ -152,6 +152,12 @@ function test_doc_from_triple_stream_to_rdf_stream() {
     streamWriter.pipe(process.stdout);
 }
 
+function test_doc_streamwriter_import() {
+    const quadStream: RDF.Stream = {} as any;
+    const streamWriter: N3.StreamWriter = new N3.StreamWriter({ prefixes: { c: N3.DataFactory.namedNode('http://example.org/cartoons#') } });
+    streamWriter.import(quadStream);
+}
+
 function test_doc_blank_nodes_and_lists() {
     const writer: N3.Writer = new N3.Writer({
         prefixes: {