diff --git a/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp_defconfig b/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp_defconfig
index 0fde4e01b58..c8f804a2005 100644
--- a/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp_defconfig
+++ b/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp_defconfig
@@ -6,3 +6,5 @@ CONFIG_NO_OPTIMIZATIONS=y
 
 # Start SYSCOUNTER on driver init
 CONFIG_NRF_GRTC_START_SYSCOUNTER=y
+
+CONFIG_FAKE_ENTROPY_NATIVE_POSIX_SEED_BY_DEFAULT=n