diff --git a/src/gc.c b/src/gc.c
index b7d5f555d4090..71b172b086ec1 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -2337,7 +2337,7 @@ STATIC_INLINE void gc_mark_memory8(jl_ptls_t ptls, jl_value_t *ary8_parent, jl_v
             pushed_chunk = 1;
         }
     }
-    for (; ary8_begin < ary8_end; ary8_begin += elsize) {
+    for (; ary8_begin < scan_end; ary8_begin += elsize) {
         for (uint8_t *pindex = elem_begin; pindex < elem_end; pindex++) {
             jl_value_t **slot = &ary8_begin[*pindex];
             new_obj = *slot;