diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index bd24ed0af208..bd294fd57497 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -2271,7 +2271,7 @@ static int parse_map_entry(const struct option *opt, const char *str,
 static int parse_max_stack(const struct option *opt, const char *str,
 			   int unset __maybe_unused)
 {
-	unsigned long *len = (unsigned long *)opt->value;
+	int *len = opt->value;
 	long val;
 	char *endptr;