diff --git a/sbin/devd/token.l b/sbin/devd/token.l
index 35e8a18e635..7a63bec36b4 100644
--- a/sbin/devd/token.l
+++ b/sbin/devd/token.l
@@ -38,6 +38,7 @@
 
 int lineno = 1;
 #define YY_NO_UNPUT
+#define YY_NO_INPUT
 
 static void
 update_lineno(const char *cp)