--- a/js/src/jsatom.cpp
+++ b/js/src/jsatom.cpp
@@ -432,17 +432,17 @@ js::AtomizeUTF8Chars(JSContext* cx, cons
 {
     // This could be optimized to hand the char16_t's directly to the JSAtom
     // instead of making a copy. UTF8CharsToNewTwoByteCharsZ should be
     // refactored to take an ExclusiveContext so that this function could also.
 
     UTF8Chars utf8(utf8Chars, utf8ByteLength);
 
     size_t length;
-    UniquePtr<char16_t> chars(JS::UTF8CharsToNewTwoByteCharsZ(cx, utf8, &length).get());
+    UniqueTwoByteChars chars(JS::UTF8CharsToNewTwoByteCharsZ(cx, utf8, &length).get());
     if (!chars)
         return nullptr;
 
     return AtomizeChars(cx, chars.get(), length);
 }
 
 bool
 js::IndexToIdSlow(ExclusiveContext* cx, uint32_t index, MutableHandleId idp)