diff --git a/src/expenses/lex.l b/src/expenses/lex.l
index 8ade3c3..8c71048 100644
--- a/src/expenses/lex.l
+++ b/src/expenses/lex.l
@@ -8,6 +8,8 @@
 #include <glib.h>
 #include "grammar.tab.h"
 %}
+
+%option caseless
                         
 DIGIT    [0-9]