diff --git a/man4/tty_ioctl.4 b/man4/tty_ioctl.4
index 2c5db8ba6..f16d8d090 100644
--- a/man4/tty_ioctl.4
+++ b/man4/tty_ioctl.4
@@ -299,7 +299,7 @@ Get the line discipline of the terminal.
 .TP
 .BI "TIOCSETD	const int *" argp
 Set the line discipline of the terminal.
-.SS "Psuedoterminal ioctls"
+.SS "Pseudoterminal ioctls"
 .TP
 .BI "TIOCPKT	const int *" argp
 Enable (when