diff --git a/[refs] b/[refs]
index bd48a6fbe000..96672cac1a14 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 80e39311ff3d7d2267ea8d259aab8dc9d5a59d61
+refs/heads/master: bf53d85ec20c228e0efdadbdb12c0f92283fcfd0
diff --git a/trunk/arch/um/os-Linux/file.c b/trunk/arch/um/os-Linux/file.c
index d7404c621ff7..b5afcfd0f861 100644
--- a/trunk/arch/um/os-Linux/file.c
+++ b/trunk/arch/um/os-Linux/file.c
@@ -191,6 +191,8 @@ int os_open_file(const char *file, struct openflags flags, int mode)
 		f |= O_TRUNC;
 	if (flags.e)
 		f |= O_EXCL;
+	if (flags.a)
+		f |= O_APPEND;
 
 	fd = open64(file, f, mode);
 	if (fd < 0)