1 files changed, 4 insertions, 0 deletions
diff --git a/py/mpz.c b/py/mpz.c
index 7800cdcc4..41b46f92f 100644
--- a/py/mpz.c
+++ b/py/mpz.c
@@ -444,6 +444,10 @@ 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;