diff --git a/lib/encoded.js b/lib/encoded.js
index d61c00f..a91b47b 100644
--- a/lib/encoded.js
+++ b/lib/encoded.js
@@ -111,7 +111,7 @@ Parser.prototype._write = function(data) {
 Parser.prototype._error = function(err) {
   this.destroy();
   this.emit('error', typeof err === 'string'
-    ? new Error(err + '')
+    ? new Error(err)
     : err);
 };
 
diff --git a/lib/json.js b/lib/json.js
index 76a923c..439a99c 100644
--- a/lib/json.js
+++ b/lib/json.js
@@ -378,7 +378,7 @@ Parser.prototype._reset = function() {
 Parser.prototype._error = function(err) {
   this.destroy();
   this.emit('error', typeof err === 'string'
-    ? new Error(err + '')
+    ? new Error(err)
     : err);
 };
 
diff --git a/lib/parted.js b/lib/parted.js
index 1cd9816..4210db7 100644
--- a/lib/parted.js
+++ b/lib/parted.js
@@ -299,7 +299,7 @@ Parser.prototype._reset = function() {
 Parser.prototype._error = function(err) {
   this.destroy();
   this.emit('error', typeof err === 'string'
-    ? new Error(err + '')
+    ? new Error(err)
     : err);
 };