diff --git a/types/rdfjs__term-set/index.d.ts b/types/rdfjs__term-set/index.d.ts
index 9787e07716..dbb2a43392 100644
--- a/types/rdfjs__term-set/index.d.ts
+++ b/types/rdfjs__term-set/index.d.ts
@@ -10,6 +10,11 @@ declare namespace TermSet {
     }
 }
 
-declare const TermSet: SetConstructor;
+interface TermSet<T extends Term = Term> extends TermSet.TermSet<T> {
+}
+// tslint:disable-next-line no-unnecessary-class
+declare class TermSet<T extends Term = Term> {
+    constructor(values?: T[] | null);
+}
 
 export = TermSet;