diff --git a/lib/ip.js b/lib/ip.js
index 4b2adb5..3b5fe8c 100644
--- a/lib/ip.js
+++ b/lib/ip.js
@@ -200,7 +200,7 @@ ip.subnet = function (addr, mask) {
     }
   }
 
-  const numberOfAddresses = 2 ** (32 - maskLength);
+  const numberOfAddresses = Math.pow(2, (32 - maskLength));
 
   return {
     networkAddress: ip.fromLong(networkAddress),