diff --git a/src/buffer b/src/buffer
index 59bd994..99adb71 160000
--- a/src/buffer
+++ b/src/buffer
@@ -1 +1 @@
-Subproject commit 59bd99417558374d53bfeee2551328c51f47cc9a
+Subproject commit 99adb71b0bd8cb2c09fd41e52334a9bcf8831327
diff --git a/src/uwsc.c b/src/uwsc.c
index 6f5875f..768b799 100644
--- a/src/uwsc.c
+++ b/src/uwsc.c
@@ -339,10 +339,10 @@ static void uwsc_io_read_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 
 #if UWSC_SSL_SUPPORT
     if (cl->ssl)
-        ret = buffer_put_fd(rb, w->fd, -1, &eof, uwsc_ssl_read, cl->ssl);
+        ret = buffer_put_fd_ex(rb, w->fd, -1, &eof, uwsc_ssl_read, cl->ssl);
     else
 #endif
-        ret = buffer_put_fd(rb, w->fd, -1, &eof, NULL, NULL);
+        ret = buffer_put_fd(rb, w->fd, -1, &eof);
 
     if (ret < 0) {
         uwsc_error(cl, UWSC_ERROR_IO, "read error");
@@ -387,10 +387,10 @@ static void uwsc_io_write_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 
 #if UWSC_SSL_SUPPORT
     if (cl->ssl)
-        ret = buffer_pull_to_fd(&cl->wb, w->fd, buffer_length(&cl->wb), uwsc_ssl_write, cl->ssl);
+        ret = buffer_pull_to_fd_ex(&cl->wb, w->fd, buffer_length(&cl->wb), uwsc_ssl_write, cl->ssl);
     else
 #endif
-        ret = buffer_pull_to_fd(&cl->wb, w->fd, buffer_length(&cl->wb), NULL, NULL);
+        ret = buffer_pull_to_fd(&cl->wb, w->fd, buffer_length(&cl->wb));
 
     if (ret < 0) {
         uwsc_error(cl, UWSC_ERROR_IO, "write error");
@@ -634,9 +634,6 @@ int uwsc_init(struct uwsc_client *cl, struct ev_loop *loop, const char *url,
     ev_timer_init(&cl->timer, uwsc_timer_cb, 0.0, 1.0);
     ev_timer_start(cl->loop, &cl->timer);
 
-    buffer_set_persistent_size(&cl->rb, UWSC_BUFFER_PERSISTENT_SIZE);
-    buffer_set_persistent_size(&cl->wb, UWSC_BUFFER_PERSISTENT_SIZE);
-
     uwsc_handshake(cl, host, port, path, extra_header);
 
     return 0;
diff --git a/src/uwsc.h b/src/uwsc.h
index 72ba2d8..14e42d6 100644
--- a/src/uwsc.h
+++ b/src/uwsc.h
@@ -33,7 +33,6 @@
 
 #define HTTP_HEAD_LIMIT             4096
 #define UWSC_MAX_CONNECT_TIME       5  /* second */
-#define UWSC_BUFFER_PERSISTENT_SIZE 4096
 
 /* WebSocket close status codes defined in RFC 6455, section 11.7 */
 enum {