diff --git a/src/api/response/iiif/presentation-api/items.js b/src/api/response/iiif/presentation-api/items.js
index 36bb0ea5..0e8386cb 100644
--- a/src/api/response/iiif/presentation-api/items.js
+++ b/src/api/response/iiif/presentation-api/items.js
@@ -42,8 +42,8 @@ function buildImageService(representativeImageUrl) {
   ];
 }
 
-function isAudioVideo(workType) {
-  return ["Audio", "Video"].includes(workType);
+function isAudioVideo(type) {
+  return ["Audio", "Video", "Sound"].includes(type);
 }
 
 function isImage(workType) {
diff --git a/test/unit/api/response/iiif/presentation-api/items.test.js b/test/unit/api/response/iiif/presentation-api/items.test.js
index 6640f874..6d938241 100644
--- a/test/unit/api/response/iiif/presentation-api/items.test.js
+++ b/test/unit/api/response/iiif/presentation-api/items.test.js
@@ -94,6 +94,7 @@ describe("IIIF response presentation API items helpers", () => {
   it("isAudioVideo(workType)", () => {
     expect(items.isAudioVideo("Audio")).to.be.true;
     expect(items.isAudioVideo("Image")).to.be.false;
+    expect(items.isAudioVideo("Sound")).to.be.true;
     expect(items.isAudioVideo("Video")).to.be.true;
   });