1 files changed, 1 insertions, 1 deletions
diff --git a/py/modstruct.c b/py/modstruct.c
index 681c58577..1103e40a5 100644
--- a/py/modstruct.c
+++ b/py/modstruct.c
@@ -76,7 +76,7 @@ STATIC mp_uint_t get_fmt_num(const char **p) {
     while (unichar_isdigit(*++num)) {
         len++;
     }
-    mp_uint_t val = (mp_uint_t)MP_OBJ_SMALL_INT_VALUE(mp_parse_num_integer(*p, len, 10));
+    mp_uint_t val = (mp_uint_t)MP_OBJ_SMALL_INT_VALUE(mp_parse_num_integer(*p, len, 10, NULL));
     *p = num;
     return val;
 }