diff --git a/src/Makefile.am b/src/Makefile.am
index c7ef029..e977ad3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,6 +2,7 @@ bin_PROGRAMS = bip bipmkpw
 bip_SOURCES = conf.y lex.l bip.c connection.c irc.c line.c log.c md5.c util.c
 bipmkpw_SOURCES = bipmkpw.c md5.c util.c
 AM_YFLAGS= -d
+BUILT_SOURCES = conf.h
 if DEBUG
 	AM_CFLAGS+=-Wall -g
 	AM_LDFLAGS+=-g