diff --git a/core/src/avm1/activation.rs b/core/src/avm1/activation.rs
index e357aaa31..f8a2a74a7 100644
--- a/core/src/avm1/activation.rs
+++ b/core/src/avm1/activation.rs
@@ -860,8 +860,9 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
             // Call `this[method_name]`
             object.call_method(&method_name.as_str(), &args, self)?
         } else {
-            // Undefined/empty method name; call `this` as a function
-            let this = self.target_clip_or_root()?.object().coerce_to_object(self);
+            // Undefined/empty method name; call `this` as a function.
+            // TODO: Pass primitive value instead of boxing (#843).
+            let this = Value::Undefined.coerce_to_object(self);
             object.call("[Anonymous]", self, this, None, &args)?
         };
 
diff --git a/core/src/avm1/timer.rs b/core/src/avm1/timer.rs
index bbcbde73f..6623286c3 100644
--- a/core/src/avm1/timer.rs
+++ b/core/src/avm1/timer.rs
@@ -50,7 +50,7 @@ impl<'gc> Timers<'gc> {
         );
 
         // TODO: `this` is undefined for non-method timer callbacks, but our VM
-        // currently doesn't allow `this` to be a Value.
+        // currently doesn't allow `this` to be a Value (#843).
         let undefined = Value::Undefined.coerce_to_object(&mut activation);
 
         let mut tick_count = 0;