diff --git a/types/n3/index.d.ts b/types/n3/index.d.ts
index 005af9f929..993af5ac07 100644
--- a/types/n3/index.d.ts
+++ b/types/n3/index.d.ts
@@ -18,7 +18,7 @@ export interface Prefixes<I = RDF.NamedNode> {
 }
 
 export type Term = NamedNode | BlankNode | Literal | Variable | DefaultGraph;
-export type PrefixedToIri = (suffix: string) => RDF.NamedNode;
+export type PrefixedToIri = (suffix: string) => NamedNode;
 
 export class NamedNode implements RDF.NamedNode {
     readonly termType: "NamedNode";
diff --git a/types/n3/n3-tests.ts b/types/n3/n3-tests.ts
index 47d6a5885d..bf49f2c6f2 100644
--- a/types/n3/n3-tests.ts
+++ b/types/n3/n3-tests.ts
@@ -239,4 +239,5 @@ function test_doc_utility() {
     const prefixes: N3.Prefixes = { rdfs: N3.DataFactory.namedNode('http://www.w3.org/2000/01/rdf-schema#') };
     const namedNode1: RDF.NamedNode = N3Util.prefix('http://www.w3.org/2000/01/rdf-schema#')('label');
     const namedNode2: RDF.NamedNode = N3Util.prefixes(prefixes)('rdfs')('label');
+    const namedNode3: N3.NamedNode = N3Util.prefixes(prefixes)('rdfs')('label');
 }