diff --git a/src/network/tcpsocket.c b/src/network/tcpsocket.c
index 81de89c..5a80efc 100644
--- a/src/network/tcpsocket.c
+++ b/src/network/tcpsocket.c
@@ -156,7 +156,7 @@ static void client_not_be_used_read_cb(struct ustream *s, int bytes) {
 
     len = ustream_read(s, buf, sizeof(buf));
     buf[len] = '\0';
-    printf("Read %d bytes from SSL connection: %s\n", len, buf);
+    printf("Read %ld bytes from SSL connection: %s\n", len, buf);
 }
 
 static void connect_cb(struct uloop_fd *f, unsigned int events) {
@@ -285,4 +285,4 @@ void print_tcp_array() {
         printf("Conenctin to Port: %d, Connected: %s\n", con->sock_addr.sin_port, con->connected ? "True" : "False");
     }
     printf("------------------\n");
-}
\ No newline at end of file
+}