diff --git a/extmod/mbedtls/mbedtls_config_common.h b/extmod/mbedtls/mbedtls_config_common.h
index 040b0598dce..4ef0f3542ae 100644
--- a/extmod/mbedtls/mbedtls_config_common.h
+++ b/extmod/mbedtls/mbedtls_config_common.h
@@ -67,6 +67,7 @@
 #define MBEDTLS_AES_C
 #define MBEDTLS_ASN1_PARSE_C
 #define MBEDTLS_ASN1_WRITE_C
+#define MBEDTLS_BASE64_C
 #define MBEDTLS_BIGNUM_C
 #define MBEDTLS_CIPHER_C
 #define MBEDTLS_CTR_DRBG_C
@@ -79,6 +80,7 @@
 #define MBEDTLS_MD_C
 #define MBEDTLS_MD5_C
 #define MBEDTLS_OID_C
+#define MBEDTLS_PEM_PARSE_C
 #define MBEDTLS_PKCS5_C
 #define MBEDTLS_PK_C
 #define MBEDTLS_PK_HAVE_ECC_KEYS