diff --git a/src/lex/lexer.l b/src/lex/lexer.l
index a17888b..d491001 100644
--- a/src/lex/lexer.l
+++ b/src/lex/lexer.l
@@ -6,6 +6,11 @@
     int yylex();
 %}
 
+// disable the following functions
+// to avoid failing code check
+%option nounput
+%option noinput
+
 %%
 .;
-%%
\ No newline at end of file
+%%