1 files changed, 1 insertions, 1 deletions

diff --git a/src/AFC.c b/src/AFC.c
index 54b3795..c97141c 100644
--- a/src/AFC.c
+++ b/src/AFC.c
@@ -819,7 +819,7 @@ afc_file_write(afc_client_t client, uint64_t handle,
         char *out_buffer = NULL;
         afc_error_t ret = AFC_E_SUCCESS;
 
-        if (!client || !client->afc_packet || !client->connection || !bytes || (handle == 0))
+        if (!client || !client->afc_packet || !client->connection || !bytes || (handle == 0) || (length < 0))
                 return AFC_E_INVALID_ARGUMENT;
 
         afc_lock(client);