diff --git a/boot/zephyr/prj.conf b/boot/zephyr/prj.conf
index e4f7d9030..9ff1ba274 100644
--- a/boot/zephyr/prj.conf
+++ b/boot/zephyr/prj.conf
@@ -1,7 +1,6 @@
 CONFIG_PM=n
 
 CONFIG_MAIN_STACK_SIZE=10240
-CONFIG_MBEDTLS_CFG_FILE="mcuboot-mbedtls-cfg.h"
 
 CONFIG_BOOT_SWAP_SAVE_ENCTLV=n
 CONFIG_BOOT_ENCRYPT_IMAGE=n