diff --git a/board/board.h b/board/board.h
index 84fca54..f89c601 100644
--- a/board/board.h
+++ b/board/board.h
@@ -23,7 +23,7 @@ void detect_board_type(void) {
     // SPI lines floating: white (TODO: is this reliable? Not really, we have to enable ESP/GPS to be able to detect this on the UART)
     set_gpio_output(GPIOC, 14, 1);
     set_gpio_output(GPIOC, 5, 1);
-    if(!detect_with_pull(GPIOB, 1, PULL_UP) && detect_with_pull(GPIOB, 15, PULL_UP)){
+    if(!detect_with_pull(GPIOB, 1, PULL_UP) && !detect_with_pull(GPIOB, 7, PULL_UP)){
       hw_type = HW_TYPE_DOS;
       current_board = &board_dos;
     } else if((detect_with_pull(GPIOA, 4, PULL_DOWN)) || (detect_with_pull(GPIOA, 5, PULL_DOWN)) || (detect_with_pull(GPIOA, 6, PULL_DOWN)) || (detect_with_pull(GPIOA, 7, PULL_DOWN))){