diff --git a/lex.l b/lex.l
index e97d007..010b24e 100644
--- a/lex.l
+++ b/lex.l
@@ -1,10 +1,13 @@
 %{
 #undef ECHO
+#include <string.h>
 #include "dis.h"
 int lineno = 0;
 char *strcpy();
 %}
 
+%option nounput
+
 digit		[0-9]
 hexdigit	[0-9a-fA-F]
 alpha		[a-zA-Z]