diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index fba2ade..49c7a09 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -60,7 +60,8 @@
 
 static int prealloc_elems_and_freelist(struct bpf_stack_map *smap)
 {
-	u32 elem_size = sizeof(struct stack_map_bucket) + smap->map.value_size;
+	u64 elem_size = sizeof(struct stack_map_bucket) +
+			(u64)smap->map.value_size;
 	int err;
 
 	smap->elems = bpf_map_area_alloc(elem_size * smap->map.max_entries,