diff --git a/man4/sd.4 b/man4/sd.4
index afd443e4c..980070b9d 100644
--- a/man4/sd.4
+++ b/man4/sd.4
@@ -25,8 +25,10 @@
 .SH NAME
 sd \- Driver for SCSI Disk Drives
 .SH SYNOPSIS
+.nf
 #include <linux/hdreg.h>        /* for HDIO_GETGEO */
 #include <linux/fs.h>           /* for BLKGETSIZE and BLKRRPART */
+.fi
 .SH CONFIG
 The block device name has the following form:
 .BI sd lp,