diff --git a/src/vm/test.rs b/src/vm/test.rs
index 8908822..4cc9e1c 100644
--- a/src/vm/test.rs
+++ b/src/vm/test.rs
@@ -144,7 +144,7 @@ fn test_attrs() {
     test_expr("{ a.b = 1; } ? a.b", boolean!(true));
     test_expr(
         "{ a.b = 1; } // { a.c = 2 }",
-        attrs! { symbol!("a") => attrs!{ symbol!("b") => int!(1), symbol!("c") => int!(2) } },
+        attrs! { symbol!("a") => attrs!{ symbol!("c") => int!(2) } },
     );
 }
 
@@ -164,6 +164,6 @@ fn test_let() {
     test_expr(r#"let a = { a = 1; }; b = "a"; in a.${b}"#, int!(1));
     test_expr(
         r#"let b = "c"; in { a.b = 1; } // { a."a${b}" = 2 }"}"#,
-        attrs! { symbol!("a") => attrs!{ symbol!("b") => int!(1), symbol!("ac") => int!(2) } },
+        attrs! { symbol!("a") => attrs!{ symbol!("ac") => int!(2) } },
     );
 }
diff --git a/src/vm/value/attrset.rs b/src/vm/value/attrset.rs
index c2b7002..dbd99a4 100644
--- a/src/vm/value/attrset.rs
+++ b/src/vm/value/attrset.rs
@@ -26,12 +26,7 @@ impl AttrSet {
 
     pub fn update(mut self, other: AttrSet) -> AttrSet {
         for (k, v) in other.data.iter() {
-            if let Some(attr) = self.data.get(k) {
-                let new_attr = attr.clone().update(v.clone());
-                self.data.insert_mut(k.clone(), new_attr);
-            } else {
-                self.push_attr(k.clone(), v.clone())
-            }
+            self.push_attr(k.clone(), v.clone())
         }
         self
     }