diff --git a/doc/sources/tutorial-client.rst b/doc/sources/tutorial-client.rst
index 98ad8baa..78c55038 100644
--- a/doc/sources/tutorial-client.rst
+++ b/doc/sources/tutorial-client.rst
@@ -249,17 +249,18 @@ data is available to read in the bufferevent input buffer::
     static void readcb(struct bufferevent *bev, void *ptr)
     {
       http2_session_data *session_data = (http2_session_data*)ptr;
-      int rv;
+      ssize_t readlen;
       struct evbuffer *input = bufferevent_get_input(bev);
       size_t datalen = evbuffer_get_length(input);
       unsigned char *data = evbuffer_pullup(input, -1);
-      rv = nghttp2_session_mem_recv(session_data->session, data, datalen);
-      if(rv < 0) {
-        warnx("Fatal error: %s", nghttp2_strerror(rv));
+
+      readlen = nghttp2_session_mem_recv(session_data->session, data, datalen);
+      if(readlen < 0) {
+        warnx("Fatal error: %s", nghttp2_strerror((int)readlen));
         delete_http2_session_data(session_data);
         return;
       }
-      evbuffer_drain(input, rv);
+      evbuffer_drain(input, readlen);
       if(session_send(session_data) != 0) {
         delete_http2_session_data(session_data);
         return;
diff --git a/doc/sources/tutorial-server.rst b/doc/sources/tutorial-server.rst
index a39ef51d..59705466 100644
--- a/doc/sources/tutorial-server.rst
+++ b/doc/sources/tutorial-server.rst
@@ -34,11 +34,10 @@ life time::
                              void *arg)
     {
       *data = next_proto_list;
-      *len = next_proto_list_len;
+      *len = (unsigned int)next_proto_list_len;
       return SSL_TLSEXT_ERR_OK;
     }
 
-
     static SSL_CTX* create_ssl_ctx(const char *key_file, const char *cert_file)
     {
       SSL_CTX *ssl_ctx;
@@ -287,16 +286,17 @@ functions for these pending data. To process received data, we call
 
     static int session_recv(http2_session_data *session_data)
     {
-      int rv;
+      ssize_t readlen;
       struct evbuffer *input = bufferevent_get_input(session_data->bev);
       size_t datalen = evbuffer_get_length(input);
       unsigned char *data = evbuffer_pullup(input, -1);
-      rv = nghttp2_session_mem_recv(session_data->session, data, datalen);
-      if(rv < 0) {
-        warnx("Fatal error: %s", nghttp2_strerror(rv));
+
+      readlen = nghttp2_session_mem_recv(session_data->session, data, datalen);
+      if(readlen < 0) {
+        warnx("Fatal error: %s", nghttp2_strerror((int)readlen));
         return -1;
       }
-      evbuffer_drain(input, rv);
+      evbuffer_drain(input, readlen);
       if(session_send(session_data) != 0) {
         return -1;
       }