diff --git a/qrexec-lib/unpack.c b/qrexec-lib/unpack.c
index 4d3acf5..c7513e8 100644
--- a/qrexec-lib/unpack.c
+++ b/qrexec-lib/unpack.c
@@ -237,6 +237,8 @@ int do_unpack(void)
     cwd_fd = open(".", O_RDONLY);
     if (cwd_fd >= 0 && syncfs(cwd_fd) == 0 && close(cwd_fd) == 0)
         errno = saved_errno;
+#else
+    sync();
 #endif
 
     send_status_and_crc(errno, untrusted_namebuf);