diff --git a/boot/zephyr/prj.conf b/boot/zephyr/prj.conf
index e14395b80..9b8696e3f 100644
--- a/boot/zephyr/prj.conf
+++ b/boot/zephyr/prj.conf
@@ -34,3 +34,4 @@ CONFIG_LOG_MODE_MINIMAL=y # former CONFIG_MODE_MINIMAL
 CONFIG_LOG_DEFAULT_LEVEL=0
 ### Decrease footprint by ~4 KB in comparison to CBPRINTF_COMPLETE=y
 CONFIG_CBPRINTF_NANO=y
+CONFIG_NRF_RTC_TIMER_USER_CHAN_COUNT=0