diff --git a/dom/indexedDB/IDBObjectStore.cpp b/dom/indexedDB/IDBObjectStore.cpp
index 7e242a59eb5b..728f10b1055b 100644
--- a/dom/indexedDB/IDBObjectStore.cpp
+++ b/dom/indexedDB/IDBObjectStore.cpp
@@ -144,12 +144,6 @@ MovingNotNull<RefPtr<IDBRequest>> GenerateRequest(
                             std::move(transaction));
 }
 
-void StructuredCloneErrorCallback(JSContext* aCx, uint32_t aErrorId,
-                                  void* aClosure, const char* aErrorMessage) {
-  // This callback is only used to prevent the default cloning TypeErrors
-  // from being thrown, as we will throw DataCloneErrors instead per spec.
-}
-
 bool StructuredCloneWriteCallback(JSContext* aCx,
                                   JSStructuredCloneWriter* aWriter,
                                   JS::Handle<JSObject*> aObj,
@@ -284,14 +278,10 @@ bool CopyingStructuredCloneWriteCallback(JSContext* aCx,
 
 nsresult GetAddInfoCallback(JSContext* aCx, void* aClosure) {
   static const JSStructuredCloneCallbacks kStructuredCloneCallbacks = {
-      nullptr /* read */,
-      StructuredCloneWriteCallback /* write */,
-      StructuredCloneErrorCallback /* reportError */,
-      nullptr /* readTransfer */,
-      nullptr /* writeTransfer */,
-      nullptr /* freeTransfer */,
-      nullptr /* canTransfer */,
-      nullptr /* sabCloned */
+      nullptr /* read */,          StructuredCloneWriteCallback /* write */,
+      nullptr /* reportError */,   nullptr /* readTransfer */,
+      nullptr /* writeTransfer */, nullptr /* freeTransfer */,
+      nullptr /* canTransfer */,   nullptr /* sabCloned */
   };
 
   MOZ_ASSERT(aCx);
@@ -565,7 +555,7 @@ bool IDBObjectStore::DeserializeValue(
   static const JSStructuredCloneCallbacks callbacks = {
       StructuredCloneReadCallback<StructuredCloneReadInfoChild>,
       nullptr,
-      StructuredCloneErrorCallback,
+      nullptr,
       nullptr,
       nullptr,
       nullptr,
@@ -1761,7 +1751,7 @@ bool IDBObjectStore::ValueWrapper::Clone(JSContext* aCx) {
   static const JSStructuredCloneCallbacks callbacks = {
       CopyingStructuredCloneReadCallback /* read */,
       CopyingStructuredCloneWriteCallback /* write */,
-      StructuredCloneErrorCallback /* reportError */,
+      nullptr /* reportError */,
       nullptr /* readTransfer */,
       nullptr /* writeTransfer */,
       nullptr /* freeTransfer */,
diff --git a/testing/web-platform/meta/IndexedDB/serialize-sharedarraybuffer-throws.https.html.ini b/testing/web-platform/meta/IndexedDB/serialize-sharedarraybuffer-throws.https.html.ini
index 9a058c09d966..bcfac5ac85dc 100644
--- a/testing/web-platform/meta/IndexedDB/serialize-sharedarraybuffer-throws.https.html.ini
+++ b/testing/web-platform/meta/IndexedDB/serialize-sharedarraybuffer-throws.https.html.ini
@@ -2,3 +2,5 @@
   expected:
     if (os == "android") and not debug: [OK, TIMEOUT]
     if (os == "android") and debug: [OK, TIMEOUT]
+  [IndexedDB: Attempting to serialize a SharedArrayBuffer should throw]
+    expected: FAIL
diff --git a/testing/web-platform/tests/IndexedDB/serialize-sharedarraybuffer-throws.https.html b/testing/web-platform/tests/IndexedDB/serialize-sharedarraybuffer-throws.https.html
index 03a71a78d25c..613ddfe99d81 100644
--- a/testing/web-platform/tests/IndexedDB/serialize-sharedarraybuffer-throws.https.html
+++ b/testing/web-platform/tests/IndexedDB/serialize-sharedarraybuffer-throws.https.html
@@ -13,7 +13,7 @@
     let open_rq = createdb(t);
     open_rq.onupgradeneeded = function(e) {
         let db = e.target.result;
-        let objStore = db.createObjectStore("test", { autoIncrement: false });
+        let objStore = db.createObjectStore("test", { keyPath:"pKey" });
 
         let sab = new SharedArrayBuffer(256);