diff --git a/lib/libc/sys/reboot.2 b/lib/libc/sys/reboot.2
index 891709dee43..411e689e121 100644
--- a/lib/libc/sys/reboot.2
+++ b/lib/libc/sys/reboot.2
@@ -86,7 +86,7 @@ the processor is simply halted; no reboot takes place.
 This option should be used with caution.
 .It Dv RB_POWEROFF
 After halting, the shutdown code will do what it can to turn
-of the power.
+off the power.
 This requires hardware support.
 .It Dv RB_INITNAME
 An option allowing the specification of an init program (see