Fix to pass mpy-cross build

1 files changed, 2 insertions, 0 deletions

diff --git a/py/mpz.c b/py/mpz.c
index 4ef00f73c..41b46f92f 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;