diff --git a/comm.h b/comm.h
index 6caf771..3553b6f 100644
--- a/comm.h
+++ b/comm.h
@@ -6,6 +6,7 @@
 #include "gen.h"
 #include <cstddef>
 #include <cstdint>
+#include <string>
 
 
 class comm
diff --git a/comm_tcp_socket_client.h b/comm_tcp_socket_client.h
index b0b15b3..5f457ab 100644
--- a/comm_tcp_socket_client.h
+++ b/comm_tcp_socket_client.h
@@ -6,7 +6,9 @@
 #include <mutex>
 #include <string>
 #include <thread>
+
 #include "comm.h"
+#include "utils.h"
 
 #if defined(_WIN32)
 #include <ws2tcpip.h>
diff --git a/comm_tcp_socket_server.h b/comm_tcp_socket_server.h
index 10114ed..fa4a98c 100644
--- a/comm_tcp_socket_server.h
+++ b/comm_tcp_socket_server.h
@@ -5,7 +5,9 @@
 #include <atomic>
 #include <mutex>
 #include <thread>
+
 #include "comm.h"
+#include "utils.h"
 
 #if defined(_WIN32)
 #include <ws2tcpip.h>