diff --git a/lib/dns/config/Makefile.in b/lib/dns/config/Makefile.in
index a320627114..fd0039633f 100644
--- a/lib/dns/config/Makefile.in
+++ b/lib/dns/config/Makefile.in
@@ -17,6 +17,8 @@ srcdir		= @srcdir@
 VPATH		= @srcdir@
 top_srcdir	= @top_srcdir@
 
+YACC		= @YACC@
+
 @BIND9_VERSION@
 
 @BIND9_INCLUDES@