diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index e4aa7431411f203559217a2e22dff17bdd4dfd43..bf01f60cd3ccb02ba6bd995e59d7e0332ff1d3e6 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -1861,6 +1861,8 @@ __owur size_t SSL_get_server_random(const SSL *ssl, unsigned char *out,
                                     size_t outlen);
 __owur size_t SSL_SESSION_get_master_key(const SSL_SESSION *ssl,
                                          unsigned char *out, size_t outlen);
+__owur int SSL_SESSION_set1_master_key(SSL_SESSION *sess, unsigned char *in,
+                                       size_t len);
 
 #define SSL_get_ex_new_index(l, p, newf, dupf, freef) \
     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL, l, p, newf, dupf, freef)
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index bcb012f1072e54dc0d6fed78aa5b0720c6a3ff5a..db14e223504a749895d2019a23bea843df647507 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -3725,6 +3725,19 @@ size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
     return outlen;
 }
 
+int SSL_SESSION_set1_master_key(SSL_SESSION *sess, unsigned char *in,
+                                size_t len)
+{
+    if (len > sizeof(sess->master_key))
+        return 0;
+
+    memcpy(sess->master_key, in, len);
+    sess->master_key_length = len;
+
+    return 1;
+}
+
+
 int SSL_set_ex_data(SSL *s, int idx, void *arg)
 {
     return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
diff --git a/util/libssl.num b/util/libssl.num
index 959e134ea0938e543e7552d469f6da887d10d44c..25e0750e1a2521bb55dce24632bc91be2227a59d 100644
--- a/util/libssl.num
+++ b/util/libssl.num
@@ -456,3 +456,4 @@ SSL_set_psk_use_session_callback        456	1_1_1	EXIST::FUNCTION:
 SSL_CTX_set_psk_use_session_callback    457	1_1_1	EXIST::FUNCTION:
 SSL_CTX_set_psk_find_session_callback   458	1_1_1	EXIST::FUNCTION:
 SSL_CIPHER_get_handshake_digest         459	1_1_1	EXIST::FUNCTION:
+SSL_SESSION_set1_master_key             460	1_1_1	EXIST::FUNCTION: