diff --git a/dom/bluetooth/BluetoothUtils.cpp b/dom/bluetooth/BluetoothUtils.cpp
index 05db1e6fa257..1949a3799cf2 100644
--- a/dom/bluetooth/BluetoothUtils.cpp
+++ b/dom/bluetooth/BluetoothUtils.cpp
@@ -27,9 +27,9 @@ SetJsObject(JSContext* aContext,
     jsval v;
     if (aData[i].value().type() == BluetoothValue::TnsString) {
       nsString data = aData[i].value().get_nsString();
-      JSString* JsData = JS_NewStringCopyN(aContext,
-                                           NS_ConvertUTF16toUTF8(data).get(),
-                                           data.Length());
+      JSString* JsData = JS_NewUCStringCopyN(aContext,
+                                             data.BeginReading(),
+                                             data.Length());
       NS_ENSURE_TRUE(JsData, false);
       v = STRING_TO_JSVAL(JsData);
     } else if (aData[i].value().type() == BluetoothValue::Tuint32_t) {