diff -Nrup a/main.c b/main.c
--- a/main.c	2016-07-05 17:44:14.957064711 -0400
+++ b/main.c	2016-07-05 17:47:26.681702820 -0400
@@ -3147,7 +3147,8 @@ clean_jobserver (int status)
                "INTERNAL: Exiting with %u jobserver tokens (should be 0)!",
                jobserver_tokens);
       else
-        while (jobserver_tokens--)
+        /* Don't write back the "free" token */
+        while (--jobserver_tokens)
           {
             int r;