diff --git a/js/ContentObject.js b/js/ContentObject.js
index 38c8066..ec2efde 100644
--- a/js/ContentObject.js
+++ b/js/ContentObject.js
@@ -11,9 +11,8 @@
  * @param {Name} name
  * @param {SignedInfo} signedInfo
  * @param {Uint8Array} content
- * @param {Signature} signature
  */
-var ContentObject = function ContentObject(name, signedInfo, content, signature) {
+var ContentObject = function ContentObject(name, signedInfo, content) {
 	if (typeof name == 'string')
 		this.name = new Name(name);
 	else
@@ -27,7 +26,7 @@
 	else 
 		this.content = content;
 	
-	this.signature = signature;
+	this.signature = new Signature();
 	
 	this.startSIG = null;
 	this.endSIG = null;
diff --git a/js/NDN.js b/js/NDN.js
index d0fdb81..f88f178 100644
--- a/js/NDN.js
+++ b/js/NDN.js
@@ -341,7 +341,7 @@
 	var si = new SignedInfo();
 	si.setFields();
 		
-	var co = new ContentObject(new Name(), si, bytes, new Signature()); 
+	var co = new ContentObject(new Name(), si, bytes); 
 	co.sign();
 	var coBinary = encodeToBinaryContentObject(co);
 		
diff --git a/tests/test-encode-decode-ContentObject.html b/tests/test-encode-decode-ContentObject.html
index 1c2cfe0..0f754f7 100644
--- a/tests/test-encode-decode-ContentObject.html
+++ b/tests/test-encode-decode-ContentObject.html
@@ -22,11 +22,7 @@
 			
 			signedInfo.setFields();
 			
-			//witness is null
-			var signature = new Signature();
-			
-			
-			var co = new ContentObject(contentname,signedInfo,content,signature); 
+			var co = new ContentObject(contentname, signedInfo, content); 
 			
 			co.sign();
 			
diff --git a/tests/test-publish-async.html b/tests/test-publish-async.html
index e3844e6..a8c0b66 100644
--- a/tests/test-publish-async.html
+++ b/tests/test-publish-async.html
@@ -33,7 +33,7 @@
 
 				var si = new SignedInfo();
 
-				var co = new ContentObject(new Name(nameStr), si, content, new Signature());
+				var co = new ContentObject(new Name(nameStr), si, content);
 				co.sign();
 
 				upcallInfo.contentObject = co;