diff --git a/lib/rng-browser.js b/lib/rng-browser.js
index aaf40f72..e5868033 100644
--- a/lib/rng-browser.js
+++ b/lib/rng-browser.js
@@ -3,8 +3,8 @@
 // and inconsistent support for the `crypto` API.  We do the best we can via
 // feature-detection
 
-var getRandomValues = typeof(crypto) != 'undefined' && crypto.getRandomValues;
-
+var getRandomValues = (typeof(crypto) != 'undefined' && crypto.getRandomValues) ||
+                      (typeof(msCrypto) != 'undefined' && msCrypto.getRandomValues);
 if (getRandomValues) {
   // WHATWG crypto RNG - http://wiki.whatwg.org/wiki/Crypto
   var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef