diff --git a/boards/sim/sim/sim/configs/crypto/defconfig b/boards/sim/sim/sim/configs/crypto/defconfig
index a1285b578a..ac3a871611 100644
--- a/boards/sim/sim/sim/configs/crypto/defconfig
+++ b/boards/sim/sim/sim/configs/crypto/defconfig
@@ -52,6 +52,7 @@ CONFIG_LIBC_LOCALE_GETTEXT=y
 CONFIG_LIBC_MAX_EXITFUNS=1
 CONFIG_LIBC_NUMBERED_ARGS=y
 CONFIG_MBEDTLS_AES_ALT=y
+CONFIG_MBEDTLS_MD5_ALT=y
 CONFIG_MBEDTLS_SHA1_ALT=y
 CONFIG_MBEDTLS_SHA256_ALT=y
 CONFIG_MBEDTLS_SHA512_ALT=y