diff --git a/js/src/builtin/Array.cpp b/js/src/builtin/Array.cpp
index 66bd525ade74..e2d26f83944d 100644
--- a/js/src/builtin/Array.cpp
+++ b/js/src/builtin/Array.cpp
@@ -453,7 +453,7 @@ bool js::GetElements(JSContext* cx, HandleObject aobj, uint32_t length,
 
   if (aobj->is<TypedArrayObject>()) {
     Handle<TypedArrayObject*> typedArray = aobj.as<TypedArrayObject>();
-    if (typedArray->length().deprecatedGetUint32() == length) {
+    if (typedArray->length().get() == length) {
       return TypedArrayObject::getElements(cx, typedArray, vp);
     }
   }
diff --git a/js/src/vm/TypedArrayObject.cpp b/js/src/vm/TypedArrayObject.cpp
index 0be5e9d2dbf8..a41dac9bac86 100644
--- a/js/src/vm/TypedArrayObject.cpp
+++ b/js/src/vm/TypedArrayObject.cpp
@@ -2190,13 +2190,13 @@ bool TypedArrayObject::getElementPure(size_t index, Value* vp) {
 bool TypedArrayObject::getElements(JSContext* cx,
                                    Handle<TypedArrayObject*> tarray,
                                    Value* vp) {
-  uint32_t length = tarray->length().deprecatedGetUint32();
+  size_t length = tarray->length().get();
   MOZ_ASSERT_IF(length > 0, !tarray->hasDetachedBuffer());
 
   switch (tarray->type()) {
 #define GET_ELEMENTS(T, N)                                                     \
   case Scalar::N:                                                              \
-    for (uint32_t i = 0; i < length; ++i, ++vp) {                              \
+    for (size_t i = 0; i < length; ++i, ++vp) {                                \
       if (!N##Array::getElement(cx, tarray, i,                                 \
                                 MutableHandleValue::fromMarkedLocation(vp))) { \
         return false;                                                          \