diff --git a/prj.conf b/prj.conf
index 3155dc9..4f84b2b 100644
--- a/prj.conf
+++ b/prj.conf
@@ -83,6 +83,10 @@ CONFIG_BT_PERIPHERAL_PREF_TIMEOUT=1000
 # Enable BLE Security Manager Protocol for pairing/bonding.
 CONFIG_BT_SMP=y
 # Allow bonding so pairing information can be stored and reused.
+# Enable mbedTLS/nRF Security backend for Bluetooth PSA crypto calls
+CONFIG_MBEDTLS=y
+CONFIG_MBEDTLS_PSA_CRYPTO_C=y
+# Allow bonding so pairing information can be stored and reused
 CONFIG_BT_BONDABLE=y
 # App provides the passkey through the auth callback.
 CONFIG_BT_APP_PASSKEY=y