diff --git a/javascript/jsapi/window.bnd b/javascript/jsapi/window.bnd
index bf3f1700d..865cbf3d4 100644
--- a/javascript/jsapi/window.bnd
+++ b/javascript/jsapi/window.bnd
@@ -38,6 +38,23 @@ binding window {
 	internal "JSObject *" location;
 }
 
+api mark %{
+	if (private != NULL) {
+		if (private->document != NULL) {
+			JS_CallTracer(trc, private->document, JSTRACE_OBJECT);
+		}
+		if (private->navigator != NULL) {
+			JS_CallTracer(trc, private->navigator, JSTRACE_OBJECT);
+		}
+		if (private->console != NULL) {
+			JS_CallTracer(trc, private->console, JSTRACE_OBJECT);
+		}
+		if (private->location != NULL) {
+			JS_CallTracer(trc, private->location, JSTRACE_OBJECT);
+		}
+	}
+%}
+
 api global %{
 %}