diff --git a/lib/libc/sys/intro.2 b/lib/libc/sys/intro.2
index 96bff831b8f2..e8415938020d 100644
--- a/lib/libc/sys/intro.2
+++ b/lib/libc/sys/intro.2
@@ -38,7 +38,7 @@
 .Nm intro
 .Nd introduction to system calls and error numbers
 .Sh SYNOPSIS
-.Fd #include <sys/errno.h>
+.Fd #include <errno.h>
 .Sh DESCRIPTION
 This section provides an overview of the system calls,
 their error returns, and other common definitions and concepts.