diff --git a/base/files/file.cc b/base/files/file.cc
index 36ae9656ee83..488663361b0a 100644
--- a/base/files/file.cc
+++ b/base/files/file.cc
@@ -31,12 +31,24 @@ File::Info::~Info() = default;
 File::File()
     : error_details_(FILE_ERROR_FAILED),
       created_(false),
-      async_(false) {
+      async_(false)
+#if defined(STARBOARD)
+      ,
+      append_(false)
+#endif
+{
 }
 
 #if !defined(OS_NACL)
 File::File(const FilePath& path, uint32_t flags)
-    : error_details_(FILE_OK), created_(false), async_(false) {
+    : error_details_(FILE_OK),
+      created_(false),
+      async_(false)
+#if defined(STARBOARD)
+      ,
+      append_(false)
+#endif
+{
   Initialize(path, flags);
 }
 #endif
@@ -47,7 +59,12 @@ File::File(PlatformFile platform_file, bool async)
     : file_(platform_file),
       error_details_(FILE_OK),
       created_(false),
-      async_(async) {
+      async_(async)
+#if defined(STARBOARD)
+      ,
+      append_(false)
+#endif
+{
 #if defined(OS_POSIX) || defined(OS_FUCHSIA)
   DCHECK_GE(platform_file, -1);
 #endif
@@ -56,7 +73,12 @@ File::File(PlatformFile platform_file, bool async)
 File::File(Error error_details)
     : error_details_(error_details),
       created_(false),
-      async_(false) {
+      async_(false)
+#if defined(STARBOARD)
+      ,
+      append_(false)
+#endif
+{
 }
 
 File::File(File&& other)
@@ -64,7 +86,13 @@ File::File(File&& other)
       tracing_path_(other.tracing_path_),
       error_details_(other.error_details()),
       created_(other.created()),
-      async_(other.async_) {}
+      async_(other.async_)
+#if defined(STARBOARD)
+      ,
+      append_(other.append_)
+#endif
+{
+}
 
 File::~File() {
   // Go through the AssertIOAllowed logic.
@@ -78,6 +106,9 @@ File& File::operator=(File&& other) {
   error_details_ = other.error_details();
   created_ = other.created();
   async_ = other.async_;
+#if defined(STARBOARD)
+  append_ = other.append_;
+#endif
   return *this;
 }