diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 6e0d9e982e02935fb1bfb213df35b7f3643f616d..3dfc347e9a6446b2a432027652e57a427b52845e 100755
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1617,7 +1617,7 @@
  *
  * Comment this macro to disable support for ALPN.
  */
-// #define MBEDTLS_SSL_ALPN
+#define MBEDTLS_SSL_ALPN
 
 /**
  * \def MBEDTLS_SSL_DTLS_ANTI_REPLAY
diff --git a/port/config/config_liteos_a.h b/port/config/config_liteos_a.h
index 4acbadc498695420ce4cd4152872819c79c4ad84..713037c1c759fc197eaf57b10ff452b400dcfd79 100755
--- a/port/config/config_liteos_a.h
+++ b/port/config/config_liteos_a.h
@@ -1617,7 +1617,7 @@
  *
  * Comment this macro to disable support for ALPN.
  */
-// #define MBEDTLS_SSL_ALPN
+#define MBEDTLS_SSL_ALPN
 
 /**
  * \def MBEDTLS_SSL_DTLS_ANTI_REPLAY
diff --git a/port/config/config_liteos_m.h b/port/config/config_liteos_m.h
index 5cf2ea8c745346ab52cc3c5e195417b2f81b9d86..c5e7e3998cd77926e8ee83b1f087a0a9933819d2 100755
--- a/port/config/config_liteos_m.h
+++ b/port/config/config_liteos_m.h
@@ -1617,7 +1617,7 @@
  *
  * Comment this macro to disable support for ALPN.
  */
-// #define MBEDTLS_SSL_ALPN
+#define MBEDTLS_SSL_ALPN
 
 /**
  * \def MBEDTLS_SSL_DTLS_ANTI_REPLAY