diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index e746642de292899e37205b54565d56f2d622c88a..f91d9bf9054ef7cf4e941c879541cc3934314c94 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -504,7 +504,7 @@ static int show_map_close_json(int fd, struct bpf_map_info *info)
 	jsonw_uint_field(json_wtr, "max_entries", info->max_entries);
 
 	if (memlock)
-		jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
+		jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock));
 	free(memlock);
 
 	if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 8a52eed19fa2b7015c82b010eb15e91d50020d3c..bc4e05542c2b40c6f7ff910ee2d09b0a0fa2aa9f 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -485,7 +485,7 @@ static void print_prog_json(struct bpf_prog_info *info, int fd)
 
 	memlock = get_fdinfo(fd, "memlock");
 	if (memlock)
-		jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
+		jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock));
 	free(memlock);
 
 	if (info->nr_map_ids)