diff --git a/man2/sched_setaffinity.2 b/man2/sched_setaffinity.2
index 080fbe7d0..cd108ba76 100644
--- a/man2/sched_setaffinity.2
+++ b/man2/sched_setaffinity.2
@@ -41,7 +41,7 @@ set and get a thread's CPU affinity mask
 .B #include <sched.h>
 .sp
 .BI "int sched_setaffinity(pid_t " pid ", size_t " cpusetsize ,
-.BI "                      cpu_set_t *" mask );
+.BI "                      const cpu_set_t *" mask );
 .sp
 .BI "int sched_getaffinity(pid_t " pid ", size_t " cpusetsize ,
 .BI "                      cpu_set_t *" mask );