diff --git a/selfdrive/ui/qt/onroad.cc b/selfdrive/ui/qt/onroad.cc
index cdde614f0b..27d6d2c4e5 100644
--- a/selfdrive/ui/qt/onroad.cc
+++ b/selfdrive/ui/qt/onroad.cc
@@ -198,7 +198,7 @@ void OnroadAlerts::paintEvent(QPaintEvent *event) {
 }
 
 // ExperimentalButton
-ExperimentalButton::ExperimentalButton(QWidget *parent) : experimental_mode(false), QPushButton(parent) {
+ExperimentalButton::ExperimentalButton(QWidget *parent) : experimental_mode(false), engageable(false), QPushButton(parent) {
   setFixedSize(btn_size, btn_size);
 
   params = Params();