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-rw-r--r--src/stdio/__fdopen.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
index a2ca62b1..a6ae73a2 100644
--- a/src/stdio/__fdopen.c
+++ b/src/stdio/__fdopen.c
@@ -32,7 +32,8 @@ FILE *__fdopen(int fd, const char *mode)
/* Set append mode on fd if opened for append */
if (*mode == 'a') {
int flags = __syscall(SYS_fcntl, fd, F_GETFL);
- __syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
+ if (!(flags & O_APPEND))
+ __syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
f->flags |= F_APP;
}