diff --git a/shell/browser/native_window_mac.mm b/shell/browser/native_window_mac.mm
index bf78f78a2631a..5bc9d6a29aba7 100644
--- a/shell/browser/native_window_mac.mm
+++ b/shell/browser/native_window_mac.mm
@@ -328,6 +328,8 @@ void ViewDidMoveToSuperview(NSView* self, SEL _cmd) {
       [](NativeWindowMac* window) {
         if (window->window_)
           window->window_ = nil;
+        if (window->buttons_proxy_)
+          window->buttons_proxy_.reset();
       },
       this));