diff --git a/man2/syslog.2 b/man2/syslog.2
index b3b205172..46928df49 100644
--- a/man2/syslog.2
+++ b/man2/syslog.2
@@ -35,10 +35,14 @@ syslog, klogctl \- read and/or clear kernel message ring buffer;
 set console_loglevel
 .SH SYNOPSIS
 .nf
-.BI "int syslog(int " type ", char *" bufp ", int " len );
+.BR "#include <sys/klog.h>" "        /* Definition of " SYSLOG_* " constants */"
+.BR "#include <sys/syscall.h>" "     /* Definition of " SYS_* " constants */"
+.B #include <unistd.h>
+.PP
+.BI "int syscall(SYS_syslog, int " type ", char *" bufp ", int " len );
 .PP
 /* The glibc interface */
-.B "#include <sys/klog.h>"
+.B #include <sys/klog.h>
 .PP
 .BI "int klogctl(int " type ", char *" bufp ", int " len );
 .fi