diff --git a/lib/child_process.js b/lib/child_process.js
index 5fcd2603940d6d..a38de2867dba5d 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -860,9 +860,9 @@ function _validateStdio(stdio, sync) {
         // Cleanup previously created pipes
         cleanup();
         if (!sync)
-          throw Error('Child process can have only one IPC pipe');
+          throw new Error('Child process can have only one IPC pipe');
         else
-          throw Error('You cannot use IPC with synchronous forks');
+          throw new Error('You cannot use IPC with synchronous forks');
       }
 
       ipc = createPipe(true);
diff --git a/lib/crypto.js b/lib/crypto.js
index 6033a85e57fd24..10ff71e8547606 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -548,7 +548,7 @@ ECDH.prototype.getPublicKey = function getPublicKey(encoding, format) {
     else if (format === 'uncompressed')
       f = constants.POINT_CONVERSION_UNCOMPRESSED;
     else
-      throw TypeError('Bad format: ' + format);
+      throw new TypeError('Bad format: ' + format);
   } else {
     f = constants.POINT_CONVERSION_UNCOMPRESSED;
   }
diff --git a/lib/dns.js b/lib/dns.js
index 4572d253f1bf96..d39eec878efc27 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -108,12 +108,13 @@ exports.lookup = function lookup(hostname, options, callback) {
 
   // Parse arguments
   if (hostname && typeof hostname !== 'string') {
-    throw TypeError('invalid arguments: hostname must be a string or falsey');
+    throw new TypeError('invalid arguments: ' +
+                        'hostname must be a string or falsey');
   } else if (typeof options === 'function') {
     callback = options;
     family = 0;
   } else if (typeof callback !== 'function') {
-    throw TypeError('invalid arguments: callback must be passed');
+    throw new TypeError('invalid arguments: callback must be passed');
   } else if (options !== null && typeof options === 'object') {
     hints = options.hints >>> 0;
     family = options.family >>> 0;
diff --git a/lib/events.js b/lib/events.js
index 6bd2a77db26907..064f3838b38ac9 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -140,7 +140,7 @@ EventEmitter.prototype.emit = function emit(type) {
     } else if (er instanceof Error) {
       throw er; // Unhandled 'error' event
     } else {
-      throw Error('Uncaught, unspecified "error" event.');
+      throw new Error('Uncaught, unspecified "error" event.');
     }
     return false;
   }
diff --git a/lib/fs.js b/lib/fs.js
index adcb708021cb23..77bcbac61a5eca 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1628,12 +1628,12 @@ function ReadStream(path, options) {
 
   if (this.start !== undefined) {
     if (typeof this.start !== 'number') {
-      throw TypeError('start must be a Number');
+      throw new TypeError('start must be a Number');
     }
     if (this.end === undefined) {
       this.end = Infinity;
     } else if (typeof this.end !== 'number') {
-      throw TypeError('end must be a Number');
+      throw new TypeError('end must be a Number');
     }
 
     if (this.start > this.end) {
@@ -1790,7 +1790,7 @@ function WriteStream(path, options) {
 
   if (this.start !== undefined) {
     if (typeof this.start !== 'number') {
-      throw TypeError('start must be a Number');
+      throw new TypeError('start must be a Number');
     }
     if (this.start < 0) {
       throw new Error('start must be >= zero');
diff --git a/lib/punycode.js b/lib/punycode.js
index 82cc20769cd088..51aa75132937d5 100644
--- a/lib/punycode.js
+++ b/lib/punycode.js
@@ -64,7 +64,7 @@
 	 * @returns {Error} Throws a `RangeError` with the applicable error message.
 	 */
 	function error(type) {
-		throw RangeError(errors[type]);
+		throw new RangeError(errors[type]);
 	}
 
 	/**