diff --git a/tests/bsim/bluetooth/audio_samples/broadcast_audio_sink/Kconfig.sysbuild b/tests/bsim/bluetooth/audio_samples/broadcast_audio_sink/Kconfig.sysbuild
index 63b369429bd..ff68acec605 100644
--- a/tests/bsim/bluetooth/audio_samples/broadcast_audio_sink/Kconfig.sysbuild
+++ b/tests/bsim/bluetooth/audio_samples/broadcast_audio_sink/Kconfig.sysbuild
@@ -7,4 +7,4 @@ config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int
 	# Let's pass the test arguments to the application MCU test
 	# otherwise by default they would have gone to the net core.
-	default 0 if $(BOARD) = "nrf5340bsim"
+	default 0 if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
diff --git a/tests/bsim/bluetooth/audio_samples/unicast_audio_client/Kconfig.sysbuild b/tests/bsim/bluetooth/audio_samples/unicast_audio_client/Kconfig.sysbuild
index ad82e381a1c..209d7f1cc73 100644
--- a/tests/bsim/bluetooth/audio_samples/unicast_audio_client/Kconfig.sysbuild
+++ b/tests/bsim/bluetooth/audio_samples/unicast_audio_client/Kconfig.sysbuild
@@ -7,4 +7,4 @@ config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int
 	# Let's pass the test arguments to the application MCU test
 	# otherwise by default they would have gone to the net core.
-	default 0 if $(BOARD) = "nrf5340bsim"
+	default 0 if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
diff --git a/tests/bsim/bluetooth/ll/bis/Kconfig.sysbuild b/tests/bsim/bluetooth/ll/bis/Kconfig.sysbuild
index f534fabcd22..6cf765d44e2 100644
--- a/tests/bsim/bluetooth/ll/bis/Kconfig.sysbuild
+++ b/tests/bsim/bluetooth/ll/bis/Kconfig.sysbuild
@@ -11,4 +11,4 @@ config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int
 	# Let's pass the test arguments to the application MCU test
 	# otherwise by default they would have gone to the net core.
-	default 0 if $(BOARD) = "nrf5340bsim"
+	default 0 if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
diff --git a/tests/bsim/bluetooth/ll/cis/Kconfig.sysbuild b/tests/bsim/bluetooth/ll/cis/Kconfig.sysbuild
index f534fabcd22..6cf765d44e2 100644
--- a/tests/bsim/bluetooth/ll/cis/Kconfig.sysbuild
+++ b/tests/bsim/bluetooth/ll/cis/Kconfig.sysbuild
@@ -11,4 +11,4 @@ config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int
 	# Let's pass the test arguments to the application MCU test
 	# otherwise by default they would have gone to the net core.
-	default 0 if $(BOARD) = "nrf5340bsim"
+	default 0 if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
diff --git a/tests/bsim/bluetooth/ll/conn/Kconfig.sysbuild b/tests/bsim/bluetooth/ll/conn/Kconfig.sysbuild
index f534fabcd22..6cf765d44e2 100644
--- a/tests/bsim/bluetooth/ll/conn/Kconfig.sysbuild
+++ b/tests/bsim/bluetooth/ll/conn/Kconfig.sysbuild
@@ -11,4 +11,4 @@ config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int
 	# Let's pass the test arguments to the application MCU test
 	# otherwise by default they would have gone to the net core.
-	default 0 if $(BOARD) = "nrf5340bsim"
+	default 0 if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"