diff --git a/extensions/pknock/Makefile.am b/extensions/pknock/Makefile.am
index e62c108..3552870 100644
--- a/extensions/pknock/Makefile.am
+++ b/extensions/pknock/Makefile.am
@@ -6,4 +6,4 @@ AM_CFLAGS   = ${regular_CFLAGS} ${libxtables_CFLAGS}
 include ../../Makefile.extra
 
 sbin_PROGRAMS = pknlusr
-man_MANS = pknlusr.8
+dist_man_MANS = pknlusr.8