diff --git a/lib/Chunk.js b/lib/Chunk.js
index 51a018ed8bd..acc20ec74d3 100644
--- a/lib/Chunk.js
+++ b/lib/Chunk.js
@@ -505,7 +505,7 @@ class Chunk {
 	}
 
 	/**
-	 * @returns {Iterable<ChunkGroup>} the chunkGroups that the said chunk is referenced in
+	 * @returns {SortableSet<ChunkGroup>} the chunkGroups that the said chunk is referenced in
 	 */
 	get groupsIterable() {
 		this._groups.sort();
diff --git a/types.d.ts b/types.d.ts
index a23e71cdd69..54de487ed5d 100644
--- a/types.d.ts
+++ b/types.d.ts
@@ -839,7 +839,7 @@ declare class Chunk {
 	removeGroup(chunkGroup: ChunkGroup): void;
 	isInGroup(chunkGroup: ChunkGroup): boolean;
 	getNumberOfGroups(): number;
-	get groupsIterable(): Iterable<ChunkGroup>;
+	get groupsIterable(): SortableSet<ChunkGroup>;
 	disconnectFromGroups(): void;
 	split(newChunk: Chunk): void;
 	updateHash(hash: Hash, chunkGraph: ChunkGraph): void;