diff --git a/src/Frame.cc b/src/Frame.cc
index 44fb4697f7..87ba277427 100644
--- a/src/Frame.cc
+++ b/src/Frame.cc
@@ -120,6 +120,17 @@ Frame* Frame::Clone() const
 	return other;
 	}
 
+Frame* Frame::LightClone() const
+	{
+	Frame* other = new Frame(0, function, func_args);
+
+	other->call = call;
+	other->assoc = assoc;
+	other->trigger = trigger;
+
+	return other;
+	}
+
 static bool val_is_func(const ValPtr& v, ScriptFunc* func)
 	{
 	if ( v->GetType()->Tag() != TYPE_FUNC )
diff --git a/src/Frame.h b/src/Frame.h
index d403b2ddad..77a5e89a30 100644
--- a/src/Frame.h
+++ b/src/Frame.h
@@ -157,6 +157,14 @@ public:
 	 */
 	Frame* Clone() const;
 
+	/**
+	 * Creates a copy of the frame that doesn't include its values,
+	 * just its trigger context.
+	 *
+	 * @return a partial copy of this frame.
+	 */
+	Frame* LightClone() const;
+
 	/**
 	 * Serializes the frame in support of copy semantics for lambdas:
 	 *