diff --git a/lib/utils/ip.js b/lib/utils/ip.js
index 05e67727..b332ef69 100644
--- a/lib/utils/ip.js
+++ b/lib/utils/ip.js
@@ -443,7 +443,7 @@ IP.toString = function toString(raw) {
     return host;
   }
 
-  throw Error('Invalid IP address: ' + raw.toString('hex'));
+  throw new Error('Invalid IP address: ' + raw.toString('hex'));
 };
 
 /**