diff --git a/ui/views/bubble/bubble_dialog_model_host.cc b/ui/views/bubble/bubble_dialog_model_host.cc
index 7e6417ba5ea20..7392795d870cb 100644
--- a/ui/views/bubble/bubble_dialog_model_host.cc
+++ b/ui/views/bubble/bubble_dialog_model_host.cc
@@ -1073,6 +1073,17 @@ View* BubbleDialogModelHost::GetInitiallyFocusedView() {
       model_->GetFieldByUniqueId(unique_id)));
 }
 
+bool BubbleDialogModelHost::ShouldAllowKeyEventsDuringInputProtection() const {
+  // ui::DialogModel::Builder::SetInitiallyFocusedField() is commonly used to
+  // give the OK button initial keyboard focus. Without this override, an Enter
+  // or Space key press that the user was already issuing when the dialog
+  // appeared bypasses InputEventActivationProtector's time-based gate (it
+  // returns false for key events when allow_key_events=true). Mirror
+  // ExternalProtocolDialog / ExtensionInstallDialogView and subject key events
+  // to the same protection window as mouse clicks.
+  return false;
+}
+
 void BubbleDialogModelHost::OnWidgetInitialized() {
   // Dialog buttons are added on dialog initialization.
   UpdateDialogButtons();
diff --git a/ui/views/bubble/bubble_dialog_model_host.h b/ui/views/bubble/bubble_dialog_model_host.h
index a577ffb9a94c2..e05eaa00b2cd5 100644
--- a/ui/views/bubble/bubble_dialog_model_host.h
+++ b/ui/views/bubble/bubble_dialog_model_host.h
@@ -115,6 +115,7 @@ class VIEWS_EXPORT BubbleDialogModelHost : public BubbleDialogDelegate,
   // TODO(pbos): Populate initparams with initial view instead of overriding
   // GetInitiallyFocusedView().
   View* GetInitiallyFocusedView() override;
+  bool ShouldAllowKeyEventsDuringInputProtection() const override;
   void OnWidgetInitialized() override;
   bool OnCloseRequested(views::Widget::ClosedReason close_reason) override;