diff --git a/lib/ber/writer.js b/lib/ber/writer.js
index d9d99af..0ea275b 100644
--- a/lib/ber/writer.js
+++ b/lib/ber/writer.js
@@ -7,7 +7,7 @@ var errors = require('./errors');
 
 ///--- Globals
 
-var newInvalidAsn1Error = errors.newInvalidAsn1Error;
+var InvalidAsn1Error = errors.newInvalidAsn1Error;
 
 var DEFAULT_OPTS = {
   size: 1024,
@@ -241,7 +241,7 @@ Writer.prototype.writeLength = function(len) {
     this._buf[this._offset++] = len >> 8;
     this._buf[this._offset++] = len;
   } else {
-    throw new InvalidAsn1ERror('Length too long (> 4 bytes)');
+    throw new InvalidAsn1Error('Length too long (> 4 bytes)');
   }
 };