From e5f7adcf5d1257cefd33831d541b829ca8267aca Mon Sep 17 00:00:00 2001
From: DavePutz <dwputz@gmail.com>
Date: Mon, 13 Jul 2020 22:54:52 -0500
Subject: [PATCH] Fix to pass mpy-cross build

---
 py/mpz.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/py/mpz.c b/py/mpz.c
index 4ef00f73c9..41b46f92ff 100644
--- a/py/mpz.c
+++ b/py/mpz.c
@@ -445,7 +445,9 @@ STATIC size_t mpn_mul(mpz_dig_t *idig, mpz_dig_t *jdig, size_t jlen, mpz_dig_t *
 
         ilen = id - oidig;
         // check to prevent usb starvation
+        #ifdef RUN_BACKGROUND_TASKS
         RUN_BACKGROUND_TASKS;
+        #endif
     }
 
     return ilen;