diff --git a/py/gc.c b/py/gc.c
index 6d6aa717ba356..69ab969da71e7 100644
--- a/py/gc.c
+++ b/py/gc.c
@@ -150,8 +150,10 @@ void gc_init(void *start, void *end) {
assert(MP_STATE_MEM(gc_pool_start) >= MP_STATE_MEM(gc_finaliser_table_start) + gc_finaliser_table_byte_len);
#endif
- // clear ATBs
- memset(MP_STATE_MEM(gc_alloc_table_start), 0, MP_STATE_MEM(gc_alloc_table_byte_len));
+ // Clear ATBs plus one more byte. The extra byte might be read when we read the final ATB and
+ // then try to count its tail. Clearing the byte ensures it is 0 and ends the chain. Without an
+ // FTB, it'll just clear the pool byte early.
+ memset(MP_STATE_MEM(gc_alloc_table_start), 0, MP_STATE_MEM(gc_alloc_table_byte_len) + 1);
#if MICROPY_ENABLE_FINALISER
// clear FTBs
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