diff --git a/board/main.c b/board/main.c
index 66653b0b..f2c93340 100644
--- a/board/main.c
+++ b/board/main.c
@@ -28,7 +28,9 @@
 // ********************* Serial debugging *********************
 
 bool check_started(void) {
-  return current_board->check_ignition() || ignition_can;
+  bool started = current_board->check_ignition() || ignition_can;
+  ignition_seen |= started;
+  return started;
 }
 
 void debug_ring_callback(uart_ring *ring) {
@@ -419,7 +421,7 @@ int main(void) {
         }
       #endif
     } else {
-      if (deepsleep_allowed && !usb_enumerated && !check_started()) {
+      if (deepsleep_allowed && !usb_enumerated && !check_started() && ignition_seen && (heartbeat_counter > 20U)) {
         usb_soft_disconnect(true);
         current_board->set_fan_power(0U);
         current_board->set_usb_power_mode(USB_POWER_CLIENT);
diff --git a/board/main_declarations.h b/board/main_declarations.h
index f9b08d4e..c1fc8703 100644
--- a/board/main_declarations.h
+++ b/board/main_declarations.h
@@ -22,6 +22,7 @@ bool heartbeat_disabled = false;            // set over USB
 
 // Enter deep sleep mode
 bool deepsleep_allowed = false;
+bool ignition_seen = false;
 
 // siren state
 bool siren_enabled = false;