diff --git a/src/gc.c b/src/gc.c
index 4a74e55e4545d..d44aa068c9c64 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -2293,7 +2293,7 @@ STATIC_INLINE void gc_mark_array8(jl_ptls_t ptls, jl_value_t *ary8_parent, jl_va
             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;