diff --git a/build/types/polyfill b/build/types/polyfill
index 0559a70fca..f25e996205 100644
--- a/build/types/polyfill
+++ b/build/types/polyfill
@@ -4,7 +4,6 @@
 +../../lib/polyfill/aria.js
 +../../lib/polyfill/encryption_scheme.js
 +../../lib/polyfill/fullscreen.js
-+../../lib/polyfill/mathround.js
 +../../lib/polyfill/mediasource.js
 +../../lib/polyfill/media_capabilities.js
 +../../lib/polyfill/orientation.js
diff --git a/lib/polyfill/mathround.js b/lib/polyfill/mathround.js
deleted file mode 100644
index 35000ec637..0000000000
--- a/lib/polyfill/mathround.js
+++ /dev/null
@@ -1,49 +0,0 @@
-/*! @license
- * Shaka Player
- * Copyright 2016 Google LLC
- * SPDX-License-Identifier: Apache-2.0
- */
-goog.provide('shaka.polyfill.MathRound');
-
-goog.require('shaka.log');
-goog.require('shaka.polyfill');
-
-/**
- * @summary A polyfill to patch math round bug on some browsers.
- * @see https://stackoverflow.com/q/12830742
- * @export
- */
-shaka.polyfill.MathRound = class {
-  /**
-   * Install the polyfill if needed.
-   * @export
-   */
-  static install() {
-    shaka.log.debug('mathRound.install');
-
-    const testNumber = shaka.polyfill.MathRound.MAX_ACCURATE_INPUT_ + 1;
-    if (Math.round(testNumber) != testNumber) {
-      shaka.log.debug('polyfill Math.round');
-      const originalMathRound = Math.round;
-      Math.round = (number) => {
-        let result = number;
-        // Due to the precision of JavaScript numbers, the number must be
-        // integer.
-        if (number <= shaka.polyfill.MathRound.MAX_ACCURATE_INPUT_) {
-          result = originalMathRound(number);
-        }
-        return result;
-      };
-    }
-  }
-};
-
-
-/**
- @const {number}
- @private
- */
-shaka.polyfill.MathRound.MAX_ACCURATE_INPUT_ = 0x10000000000000;
-
-
-shaka.polyfill.register(shaka.polyfill.MathRound.install);