diff --git a/ixwebsocket/IXWebSocketCloseInfo.h b/ixwebsocket/IXWebSocketCloseInfo.h
index 27000412..409e74fd 100644
--- a/ixwebsocket/IXWebSocketCloseInfo.h
+++ b/ixwebsocket/IXWebSocketCloseInfo.h
@@ -6,6 +6,9 @@
 
 #pragma once
 
+#include <cstdint>
+#include <string>
+
 namespace ix
 {
     struct WebSocketCloseInfo
diff --git a/ixwebsocket/IXWebSocketErrorInfo.h b/ixwebsocket/IXWebSocketErrorInfo.h
index 03c074cc..16f3215e 100644
--- a/ixwebsocket/IXWebSocketErrorInfo.h
+++ b/ixwebsocket/IXWebSocketErrorInfo.h
@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <string>
 
 namespace ix
diff --git a/ixwebsocket/IXWebSocketOpenInfo.h b/ixwebsocket/IXWebSocketOpenInfo.h
index 13289a92..37bff41e 100644
--- a/ixwebsocket/IXWebSocketOpenInfo.h
+++ b/ixwebsocket/IXWebSocketOpenInfo.h
@@ -6,6 +6,10 @@
 
 #pragma once
 
+#include <cstdint>
+#include <string>
+#include "IXWebSocketHttpHeaders.h"
+
 namespace ix
 {
     struct WebSocketOpenInfo