--- a/dom/media/test/test_texttrackcue.html
+++ b/dom/media/test/test_texttrackcue.html
@@ -125,17 +125,17 @@ SpecialPowers.pushPrefEnv({"set": [["med
           is(cue[prop], val, "Cue's " + prop + " should be " + val);
           if (typeof val === "string") {
             cue[prop] = val.toUpperCase();
             is(cue[prop], val, "Cue's " + prop + " should be " + val);
           }
         });
       }
 
-      checkEnumValue("align", "middle", [ "start", "left", "middle", "right", "end" ]);
+      checkEnumValue("align", "center", [ "start", "left", "center", "right", "end" ]);
       checkEnumValue("lineAlign", "start", [ "start", "center", "end" ]);
       checkEnumValue("vertical", "", [ "", "lr", "rl" ]);
 
       cue.lineAlign = "center";
       is(cue.lineAlign, "center", "Cue's line align should be center.");
       cue.lineAlign = "START";
       is(cue.lineAlign, "center", "Cue's line align should be center.");
       cue.lineAlign = "end";