diff --git a/usr.sbin/makefs/cd9660/iso9660_rrip.c b/usr.sbin/makefs/cd9660/iso9660_rrip.c
index 40acf40c9b09..5382857c6ac7 100644
--- a/usr.sbin/makefs/cd9660/iso9660_rrip.c
+++ b/usr.sbin/makefs/cd9660/iso9660_rrip.c
@@ -634,7 +634,7 @@ cd9660_createSL(cd9660node *node)
 int
 cd9660node_rrip_px(struct ISO_SUSP_ATTRIBUTES *v, fsnode *pxinfo)
 {
-	v->attr.rr_entry.PX.h.length[0] = 36;
+	v->attr.rr_entry.PX.h.length[0] = 44;
 	v->attr.rr_entry.PX.h.version[0] = 1;
 	cd9660_bothendian_dword(pxinfo->inode->st.st_mode,
 	    v->attr.rr_entry.PX.mode);
@@ -644,8 +644,9 @@ cd9660node_rrip_px(struct ISO_SUSP_ATTRIBUTES *v, fsnode *pxinfo)
 	    v->attr.rr_entry.PX.uid);
 	cd9660_bothendian_dword(pxinfo->inode->st.st_gid,
 	    v->attr.rr_entry.PX.gid);
+	cd9660_bothendian_dword(pxinfo->inode->st.st_ino,
+	    v->attr.rr_entry.PX.serial);
 
-	/* Ignoring the serial number for now */
 	return 1;
 }
 
diff --git a/usr.sbin/makefs/cd9660/iso9660_rrip.h b/usr.sbin/makefs/cd9660/iso9660_rrip.h
index 3653ac6d0267..3570301981df 100644
--- a/usr.sbin/makefs/cd9660/iso9660_rrip.h
+++ b/usr.sbin/makefs/cd9660/iso9660_rrip.h
@@ -103,7 +103,7 @@ typedef struct {
 	u_char links		[ISODCL(13,20)];
 	u_char uid		[ISODCL(21,28)];
 	u_char gid		[ISODCL(29,36)];
-	u_char serial		[ISODCL(37,44)];/* Not used */
+	u_char serial		[ISODCL(37,44)];
 } ISO_RRIP_PX;
 
 typedef struct {