diff --git a/convert-dtsv0-lexer.l b/convert-dtsv0-lexer.l
index 194f635..9e75085 100644
--- a/convert-dtsv0-lexer.l
+++ b/convert-dtsv0-lexer.l
@@ -17,7 +17,7 @@
  *                                                                   USA
  */
 
-%option noyywrap nounput
+%option noyywrap nounput noinput
 
 %x INCLUDE
 %x BYTESTRING