diff --git a/lib/hx509/sel-lex.l b/lib/hx509/sel-lex.l
index bb7e8374c..4c9396750 100644
--- a/lib/hx509/sel-lex.l
+++ b/lib/hx509/sel-lex.l
@@ -50,7 +50,6 @@ unsigned lineno = 1;
 
 static char * handle_string(void);
 static int lex_input(char *, int);
-static int lex_classic_input(void);
 
 struct hx_expr_input _hx509_expr_input;