diff --git a/resources/chromium/nfc-mock.js b/resources/chromium/nfc-mock.js
index 2c1724b7592eb1..5cac21bc076f41 100644
--- a/resources/chromium/nfc-mock.js
+++ b/resources/chromium/nfc-mock.js
@@ -133,7 +133,7 @@ function matchesWatchOptions(message, options) {
         options.recordType !== record.recordType) {
       continue;
     }
-    if (options.mediaType !== '' && options.mediaType !== record.mediaType) {
+    if (options.mediaType != null && options.mediaType !== record.mediaType) {
       continue;
     }