diff --git a/boot/zephyr/io_bm.c b/boot/zephyr/io_bm.c
index 798cf7a3f..788bfab9e 100644
--- a/boot/zephyr/io_bm.c
+++ b/boot/zephyr/io_bm.c
@@ -93,6 +93,9 @@ bool io_detect_pin(void)
 
     nrf_gpio_cfg_input(BOARD_PIN_BTN_0, BM_BUTTONS_PIN_PULLUP);
 
+    /* Delay 5 us for pull-up to be applied */
+    k_busy_wait(5);
+
     pin_active = (bool)nrf_gpio_pin_read(BOARD_PIN_BTN_0);
 
     if (!pin_active) {