--- common.c.orig
+++ common.c
@@ -314,7 +314,7 @@
 
       /* If fd == 0, then we are using --stdin-stdout so write to stdout,
        * not fd. */
-      m = write_all (fd ? fd : 0, buf, (size_t)n);
+      m = write_all (fd ? fd : 1, buf, (size_t)n);
       log_annoying ("write_all (%d, %p, %d) = %d", fd ? fd : 1, buf, n, m);
       return m;
     }