2 files changed, 9 insertions, 17 deletions
diff --git a/src/cli/runtime/Obj.cs b/src/cli/runtime/Obj.cs
index 9f201cd7..d1d969c9 100644
--- a/src/cli/runtime/Obj.cs
+++ b/src/cli/runtime/Obj.cs
@@ -15,13 +15,13 @@ using System;
 namespace clojure.lang
 {
 
-public class Obj : IObj
-{
+public class Obj{
+
 volatile IPersistentMap _attrs = PersistentArrayIdentityMap.EMPTY;
 
-public Object putAttr( Object key, Object val)
+public Object addAttr( Object key, Object val)
 	{
-	_attrs = _attrs.put(key, val);
+	_attrs = _attrs.add(key, val);
 	return val;
 	}
 
@@ -38,10 +38,6 @@ public bool hasAttr( Object key){
 public IPersistentMap attrs() {
     return _attrs;
 }
-
-public void removeAttr(Object key) {
-    _attrs = _attrs.remove(key);
-}
 
 }
 
diff --git a/src/jvm/clojure/lang/Obj.java b/src/jvm/clojure/lang/Obj.java
index 5714a4b4..f0f81976 100644
--- a/src/jvm/clojure/lang/Obj.java
+++ b/src/jvm/clojure/lang/Obj.java
@@ -12,15 +12,14 @@
 
 package clojure.lang;
 
-public class Obj implements IObj {
+public class Obj {
 
 volatile IPersistentMap _attrs = PersistentArrayIdentityMap.EMPTY;
 
-public Object putAttr( Object key, Object val)
-	{
-	_attrs = _attrs.put(key, val);
-	return val;
-	}
+public Object addAttr( Object key, Object val) throws Exception {
+    _attrs = _attrs.add(key, val);
+    return val;
+    }
 
 public Object getAttr( Object key)
 	{
@@ -36,7 +35,4 @@ public IPersistentMap attrs() {
     return _attrs;
 }
 
-public void removeAttr(Object key) {
-    _attrs = _attrs.remove(key);
-}
 }