--- a/js/src/vm/Xdr.h
+++ b/js/src/vm/Xdr.h
@@ -4,17 +4,16 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef vm_Xdr_h
 #define vm_Xdr_h
 
 #include "mozilla/EndianUtils.h"
 #include "mozilla/MaybeOneOf.h"
-#include "mozilla/TypeTraits.h"
 #include "mozilla/Utf8.h"
 
 #include <type_traits>
 
 #include "jsapi.h"
 #include "jsfriendapi.h"
 #include "NamespaceImports.h"
 
@@ -341,19 +340,17 @@ class XDRState : public XDRCoderBase {
   }
 
   /*
    * Use SFINAE to refuse any specialization which is not an enum.  Uses of
    * this function do not have to specialize the type of the enumerated field
    * as C++ will extract the parameterized from the argument list.
    */
   template <typename T>
-  XDRResult codeEnum32(
-      T* val,
-      std::enable_if_t<mozilla::IsEnum<T>::value>* = nullptr) {
+  XDRResult codeEnum32(T* val, std::enable_if_t<std::is_enum_v<T>>* = nullptr) {
     // Mix the enumeration value with a random magic number, such that a
     // corruption with a low-ranged value (like 0) is less likely to cause a
     // miss-interpretation of the XDR content and instead cause a failure.
     const uint32_t MAGIC = 0x21AB218C;
     uint32_t tmp;
     if (mode == XDR_ENCODE) {
       tmp = uint32_t(*val) ^ MAGIC;
     }