diff --git a/selfdrive/ui/qt/home.cc b/selfdrive/ui/qt/home.cc
index f5eab4664..f93b59000 100644
--- a/selfdrive/ui/qt/home.cc
+++ b/selfdrive/ui/qt/home.cc
@@ -157,9 +157,9 @@ OffroadHome::OffroadHome(QWidget* parent) : QFrame(parent) {
     left_widget->addWidget(new PrimeAdWidget);
     left_widget->setStyleSheet("border-radius: 10px;");
 
-    left_widget->setCurrentIndex(uiState()->primeType() ? 0 : 1);
-    connect(uiState(), &UIState::primeTypeChanged, [=](PrimeType prime_type) {
-      left_widget->setCurrentIndex((prime_type != PrimeType::NONE) ? 0 : 1);
+    left_widget->setCurrentIndex(uiState()->hasPrime() ? 0 : 1);
+    connect(uiState(), &UIState::primeChanged, [=](bool prime) {
+      left_widget->setCurrentIndex(prime ? 0 : 1);
     });
 
     home_layout->addWidget(left_widget, 1);
diff --git a/selfdrive/ui/ui.cc b/selfdrive/ui/ui.cc
index 7b12d5488..fa857c769 100644
--- a/selfdrive/ui/ui.cc
+++ b/selfdrive/ui/ui.cc
@@ -270,9 +270,16 @@ void UIState::update() {
 
 void UIState::setPrimeType(PrimeType type) {
   if (type != prime_type) {
+    bool prev_prime = hasPrime();
+
     prime_type = type;
     Params().put("PrimeType", std::to_string(prime_type));
     emit primeTypeChanged(prime_type);
+
+    bool prime = hasPrime();
+    if (prev_prime != prime) {
+      emit primeChanged(prime);
+    }
   }
 }
 
diff --git a/selfdrive/ui/ui.h b/selfdrive/ui/ui.h
index cac899527..bd9d05942 100644
--- a/selfdrive/ui/ui.h
+++ b/selfdrive/ui/ui.h
@@ -164,6 +164,7 @@ public:
 
   void setPrimeType(PrimeType type);
   inline PrimeType primeType() const { return prime_type; }
+  inline bool hasPrime() const { return prime_type != PrimeType::UNKNOWN && prime_type != PrimeType::NONE; }
 
   int fb_w = 0, fb_h = 0;
 
@@ -179,6 +180,7 @@ public:
 signals:
   void uiUpdate(const UIState &s);
   void offroadTransition(bool offroad);
+  void primeChanged(bool prime);
   void primeTypeChanged(PrimeType prime_type);
 
 private slots: