diff --git a/lib/text/vtt_text_parser.js b/lib/text/vtt_text_parser.js
index 6e417e0742..445b7c162b 100644
--- a/lib/text/vtt_text_parser.js
+++ b/lib/text/vtt_text_parser.js
@@ -783,7 +783,8 @@ shaka.text.VttTextParser = class {
     } else if ((results = /^size:([\d.]+)%$/.exec(word))) {
       cue.size = Number(results[1]);
     } else if ((results =
-        /^position:([\d.]+)%(?:,(line-left|line-right|center|start|end))?$/
+        // eslint-disable-next-line max-len
+        /^position:([\d.]+)%(?:,(line-left|line-right|middle|center|start|end))?$/
             .exec(word))) {
       cue.position = Number(results[1]);
       if (results[2]) {