diff --git a/src/display/annotation_storage.js b/src/display/annotation_storage.js
index 312643362..0a1ce895d 100644
--- a/src/display/annotation_storage.js
+++ b/src/display/annotation_storage.js
@@ -303,9 +303,15 @@ class AnnotationStorage {
         ids.push(value.annotationElementId);
       }
     }
+    let hash = "";
+    if (ids.length) {
+      const h = new MurmurHash3_64();
+      h.update(ids.join(","));
+      hash = h.hexdigest();
+    }
     return (this.#modifiedIds = {
       ids: new Set(ids),
-      hash: ids.join(","),
+      hash,
     });
   }