diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 34fff17..87f4d7b 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -413,9 +413,7 @@
 }
 
 int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb) {
-  CRYPTO_w_lock(CRYPTO_LOCK_SSL);
   ssl->generate_session_id = cb;
-  CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
   return 1;
 }