3 files changed, 5 insertions, 3 deletions
diff --git a/dom/fs/api/FileSystemDirectoryHandle.cpp b/dom/fs/api/FileSystemDirectoryHandle.cpp
index 3529f29e78..bdc8185e3a 100644
--- a/dom/fs/api/FileSystemDirectoryHandle.cpp
+++ b/dom/fs/api/FileSystemDirectoryHandle.cpp
@@ -6,6 +6,8 @@
 
 #include "FileSystemDirectoryHandle.h"
 
+#include <cstdint>
+
 #include "FileSystemDirectoryIteratorFactory.h"
 #include "fs/FileSystemRequestHandler.h"
 #include "js/StructuredClone.h"
@@ -153,7 +155,7 @@ already_AddRefed<FileSystemDirectoryHandle>
 FileSystemDirectoryHandle::ReadStructuredClone(
     JSContext* aCx, nsIGlobalObject* aGlobal,
     JSStructuredCloneReader* aReader) {
-  uint32_t kind = static_cast<uint32_t>(FileSystemHandleKind::EndGuard_);
+  uint32_t kind = UINT32_MAX;
 
   if (!JS_ReadBytes(aReader, reinterpret_cast<void*>(&kind),
                     sizeof(uint32_t))) {
diff --git a/dom/fs/api/FileSystemFileHandle.cpp b/dom/fs/api/FileSystemFileHandle.cpp
index 4d8306857f..83d2933af5 100644
--- a/dom/fs/api/FileSystemFileHandle.cpp
+++ b/dom/fs/api/FileSystemFileHandle.cpp
@@ -99,7 +99,7 @@ already_AddRefed<FileSystemFileHandle>
 FileSystemFileHandle::ReadStructuredClone(JSContext* aCx,
                                           nsIGlobalObject* aGlobal,
                                           JSStructuredCloneReader* aReader) {
-  uint32_t kind = static_cast<uint32_t>(FileSystemHandleKind::EndGuard_);
+  uint32_t kind = UINT32_MAX;
 
   if (!JS_ReadBytes(aReader, reinterpret_cast<void*>(&kind),
                     sizeof(uint32_t))) {
diff --git a/dom/fs/api/FileSystemHandle.cpp b/dom/fs/api/FileSystemHandle.cpp
index d0accdea00..79151920c0 100644
--- a/dom/fs/api/FileSystemHandle.cpp
+++ b/dom/fs/api/FileSystemHandle.cpp
@@ -210,7 +210,7 @@ already_AddRefed<FileSystemHandle> FileSystemHandle::ReadStructuredClone(
     JSStructuredCloneReader* aReader) {
   LOG_VERBOSE(("Reading File/DirectoryHandle"));
 
-  uint32_t kind = static_cast<uint32_t>(FileSystemHandleKind::EndGuard_);
+  uint32_t kind = UINT32_MAX;
 
   if (!JS_ReadBytes(aReader, reinterpret_cast<void*>(&kind),
                     sizeof(uint32_t))) {