diff --git a/boards/nordic/nrf54h20dk/Kconfig.defconfig b/boards/nordic/nrf54h20dk/Kconfig.defconfig
index e37975f96ad..fd63b39f501 100644
--- a/boards/nordic/nrf54h20dk/Kconfig.defconfig
+++ b/boards/nordic/nrf54h20dk/Kconfig.defconfig
@@ -6,6 +6,9 @@ if BOARD_NRF54H20DK_NRF54H20_CPUAPP
 config BT_HCI_IPC
 	default y if BT
 
+config MAX_THREAD_BYTES
+	default 3 if USERSPACE
+
 endif # BOARD_NRF54H20DK_NRF54H20_CPUAPP
 
 if BOARD_NRF54H20DK_NRF54H20_CPURAD
@@ -13,4 +16,7 @@ if BOARD_NRF54H20DK_NRF54H20_CPURAD
 config BT_CTLR
 	default y if BT
 
+config MAX_THREAD_BYTES
+	default 3 if USERSPACE
+
 endif # BOARD_NRF54H20DK_NRF54H20_CPURAD