diff --git a/lib/libc/net/nslexer.l b/lib/libc/net/nslexer.l
index 17cfef8af7a2..946aace3a8a8 100644
--- a/lib/libc/net/nslexer.l
+++ b/lib/libc/net/nslexer.l
@@ -50,6 +50,7 @@ static char *rcsid =
 
 %}
 
+%option never-interactive
 %option noinput
 %option nounput
 %option yylineno