diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 495e02c..cb29b83 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -185,6 +185,9 @@
 #define MBEDTLS_SSL_PRESET_DEFAULT              0
 #define MBEDTLS_SSL_PRESET_SUITEB               2
 
+#define MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED       1
+#define MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED      0
+
 /*
  * Default range for DTLS retransmission timer value, in milliseconds.
  * RFC 6347 4.2.4.1 says from 1 second to 60 seconds.
@@ -749,6 +752,10 @@
 #if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
     unsigned int fallback : 1;      /*!< is this a fallback?                */
 #endif
+#if defined(MBEDTLS_SSL_SRV_C)
+    unsigned int cert_req_ca_list : 1;  /*!< enable sending CA list in
+                                          Certificate Request messages?     */
+#endif
 };
 
 
@@ -2031,6 +2038,20 @@
 void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 );
 #endif /* MBEDTLS_ARC4_C */
 
+#if defined(MBEDTLS_SSL_SRV_C)
+/**
+ * \brief          Whether to send a list of acceptable CAs in
+ *                 CertificateRequest messages.
+ *                 (Default: do send)
+ *
+ * \param conf     SSL configuration
+ * \param cert_req_ca_list   MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED or
+ *                          MBEDTLS_SSL_CERT_REQ_CA_LIST_DISABLED
+ */
+void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
+                                          char cert_req_ca_list );
+#endif /* MBEDTLS_SSL_SRV_C */
+
 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
 /**
  * \brief          Set the maximum fragment length to emit and/or negotiate
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index fc0d2d7..4c528bb 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -2588,35 +2588,40 @@
      * opaque DistinguishedName<1..2^16-1>;
      */
     p += 2;
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
-    if( ssl->handshake->sni_ca_chain != NULL )
-        crt = ssl->handshake->sni_ca_chain;
-    else
-#endif
-        crt = ssl->conf->ca_chain;
 
     total_dn_size = 0;
-    while( crt != NULL && crt->version != 0 )
+
+    if( ssl->conf->cert_req_ca_list ==  MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED )
     {
-        dn_size = crt->subject_raw.len;
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+        if( ssl->handshake->sni_ca_chain != NULL )
+            crt = ssl->handshake->sni_ca_chain;
+        else
+#endif
+            crt = ssl->conf->ca_chain;
 
-        if( end < p ||
-            (size_t)( end - p ) < dn_size ||
-            (size_t)( end - p ) < 2 + dn_size )
+        while( crt != NULL && crt->version != 0 )
         {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
-            break;
+            dn_size = crt->subject_raw.len;
+
+            if( end < p ||
+                (size_t)( end - p ) < dn_size ||
+                (size_t)( end - p ) < 2 + dn_size )
+            {
+                MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
+                break;
+            }
+
+            *p++ = (unsigned char)( dn_size >> 8 );
+            *p++ = (unsigned char)( dn_size      );
+            memcpy( p, crt->subject_raw.p, dn_size );
+            p += dn_size;
+
+            MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size );
+
+            total_dn_size += 2 + dn_size;
+            crt = crt->next;
         }
-
-        *p++ = (unsigned char)( dn_size >> 8 );
-        *p++ = (unsigned char)( dn_size      );
-        memcpy( p, crt->subject_raw.p, dn_size );
-        p += dn_size;
-
-        MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size );
-
-        total_dn_size += 2 + dn_size;
-        crt = crt->next;
     }
 
     ssl->out_msglen  = p - buf;
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index d9ab832..00a57ff 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -6050,6 +6050,14 @@
 }
 #endif
 
+#if defined(MBEDTLS_SSL_SRV_C)
+void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
+                                          char cert_req_ca_list )
+{
+    conf->cert_req_ca_list = cert_req_ca_list;
+}
+#endif
+
 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
 void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
 {
@@ -7232,6 +7240,10 @@
     conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
 #endif
 
+#if defined(MBEDTLS_SSL_SRV_C)
+    conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED;
+#endif
+
 #if defined(MBEDTLS_SSL_PROTO_DTLS)
     conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
     conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;