diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 930b6a57bf0c37b84ecfcba8c5c70d8b4db11c05..cc6d762f1dac232b9f830696fd683bfdce33f5ab 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -2446,7 +2446,7 @@
  * \warning   DES/3DES are considered weak ciphers and their use constitutes a
  *            security risk. We recommend considering stronger ciphers instead.
  */
-//#define MBEDTLS_DES_C
+#define MBEDTLS_DES_C
 
 /**
  * \def MBEDTLS_DHM_C
diff --git a/port/config/config_liteos_a.h b/port/config/config_liteos_a.h
index 520b359aa7d2497041942191618559ea0760eeac..34d004ec918e1e53b97a892fef5ba549066d69b2 100755
--- a/port/config/config_liteos_a.h
+++ b/port/config/config_liteos_a.h
@@ -2208,7 +2208,7 @@
  * \warning   DES is considered a weak cipher and its use constitutes a
  *            security risk. We recommend considering stronger ciphers instead.
  */
-//#define MBEDTLS_DES_C
+#define MBEDTLS_DES_C
 
 /**
  * \def MBEDTLS_DHM_C
diff --git a/port/config/config_liteos_m.h b/port/config/config_liteos_m.h
index d01905f7fe25da30cec0adfecf8a26619296db2c..2a905c671f5a034969d60f96d3e9fb818c0c3bbc 100755
--- a/port/config/config_liteos_m.h
+++ b/port/config/config_liteos_m.h
@@ -2207,7 +2207,7 @@
  * \warning   DES is considered a weak cipher and its use constitutes a
  *            security risk. We recommend considering stronger ciphers instead.
  */
-//#define MBEDTLS_DES_C
+#define MBEDTLS_DES_C
 
 /**
  * \def MBEDTLS_DHM_C