diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index c80acdf..f67bce2 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -22,7 +22,7 @@
 static char			const *input_name = "perf.data";
 
 static char			default_sort_order[] = "avg, max, switch, runtime";
-static char			*sort_order = default_sort_order;
+static const char		*sort_order = default_sort_order;
 
 static int			profile_cpu = -1;