diff --git a/features/mbedtls/importer/adjust-config.sh b/features/mbedtls/importer/adjust-config.sh
index d6cc758a73..c1e7eb3855 100755
--- a/features/mbedtls/importer/adjust-config.sh
+++ b/features/mbedtls/importer/adjust-config.sh
@@ -140,6 +140,8 @@ conf unset MBEDTLS_SSL_TRUNCATED_HMAC
 
 conf unset MBEDTLS_PLATFORM_TIME_TYPE_MACRO
 
+conf set MBEDTLS_MPI_MAX_SIZE     512
+
 # The following configurations are a needed for Mbed Crypto submodule.
 # They are related to the persistent key storage feature.
 conf set MBEDTLS_PSA_CRYPTO_STORAGE_C