diff --git a/lib/output.js b/lib/output.js
index 62dbf49b..05f8b5d1 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -1282,6 +1282,7 @@ function OutputStream(options) {
             0x0a   , // \n
             0x0d   , // \r
             0x00   , // \0
+            0x1f   ,
             0xfeff , // Unicode BOM
             0xffff , // Unicode noncharacter
             0x2028 , // unicode "line separator"