diff --git a/lib/asn1/Makefile.am b/lib/asn1/Makefile.am
index 6f3453270..d6d0fae53 100644
--- a/lib/asn1/Makefile.am
+++ b/lib/asn1/Makefile.am
@@ -5,6 +5,8 @@ AUTOMAKE_OPTIONS = no-dependencies foreign
 WFLAGS=@WFLAGS@
 CFLAGS=$(WFLAGS) @CFLAGS@
 
+YFLAGS = -d
+
 lib_LIBRARIES = libasn1.a
 
 SUFFIXES = .x
@@ -51,16 +53,6 @@ asn1_compile_LDADD = -L../roken -lroken @LEXLIB@
 
 CLEANFILES = lex.c parse.c parse.h asn1.h $(BUILT_SOURCES) $(foo) asn1_files
 
-parse.c: parse.y
-	$(YACC) -d $(YFLAGS) $(srcdir)/parse.y
-	mv y.tab.c parse.c
-
-parse.h: parse.c
-	mv y.tab.h parse.h
-
-lex.c: lex.l
-	$(LEX) $(LFLAGS) -t $(srcdir)/lex.l > lex.c
-
 lex.o: parse.h
 
 $(foo) asn1.h: asn1_files