1 files changed, 1 insertions, 1 deletions
diff --git a/py/obj.c b/py/obj.c
index b35ed57c15..4d363e8a69 100644
--- a/py/obj.c
+++ b/py/obj.c
@@ -56,7 +56,7 @@ const char *mp_obj_get_type_str(mp_const_obj_t o_in) {
 void mp_obj_print_helper(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
     // There can be data structures nested too deep, or just recursive
     MP_STACK_CHECK();
-#if !NDEBUG
+#ifndef NDEBUG
     if (o_in == NULL) {
         print(env, "(nil)");
         return;