diff --git a/cc/builder.go b/cc/builder.go
index f2bab8c..9f20b87 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -361,6 +361,7 @@
 	protoOptionsFile bool
 
 	yacc *YaccProperties
+	lex  *LexProperties
 }
 
 type Objects struct {