diff --git a/src/content-handlers/iiif/IIIFContentHandler.ts b/src/content-handlers/iiif/IIIFContentHandler.ts
index cc48e57cd..408f8f982 100644
--- a/src/content-handlers/iiif/IIIFContentHandler.ts
+++ b/src/content-handlers/iiif/IIIFContentHandler.ts
@@ -142,6 +142,7 @@ export default class IIIFContentHandler
     this._extensionRegistry[MediaType.GLB] = Extension.MODELVIEWER;
     this._extensionRegistry[MediaType.GLTF] = Extension.MODELVIEWER;
     this._extensionRegistry[MediaType.JPG] = Extension.OSD;
+    this._extensionRegistry[MediaType.M3U8] = Extension.AV;
     this._extensionRegistry[MediaType.MP3] = Extension.AV;
     this._extensionRegistry[MediaType.MPEG] = Extension.AV;
     this._extensionRegistry[MediaType.MPEG_DASH] = Extension.AV;