diff --git a/features/cryptocell/FEATURE_CRYPTOCELL310/cc_internal.c b/features/cryptocell/FEATURE_CRYPTOCELL310/cc_internal.c
index acad6d5482..e53d438725 100644
--- a/features/cryptocell/FEATURE_CRYPTOCELL310/cc_internal.c
+++ b/features/cryptocell/FEATURE_CRYPTOCELL310/cc_internal.c
@@ -143,6 +143,8 @@ int convert_CrysError_to_mbedtls_err( CRYSError_t Crys_err )
     case CRYS_ECPKI_GEN_KEY_INVALID_PRIVATE_KEY_PTR_ERROR:
     case CRYS_ECPKI_EXPORT_PUBL_KEY_INVALID_PUBL_KEY_DATA_ERROR:
     case CRYS_ECPKI_BUILD_KEY_INVALID_PRIV_KEY_DATA_ERROR:
+    case CRYS_ECPKI_BUILD_KEY_INVALID_PRIV_KEY_SIZE_ERROR:
+    case CRYS_ECPKI_BUILD_KEY_INVALID_PUBL_KEY_SIZE_ERROR:
         return ( MBEDTLS_ERR_ECP_INVALID_KEY );
 
     default: