diff --git a/direct/src/plugin_standalone/p3dEmbed.h b/direct/src/plugin_standalone/p3dEmbed.h
index ccc5739af6..1dca69f100 100755
--- a/direct/src/plugin_standalone/p3dEmbed.h
+++ b/direct/src/plugin_standalone/p3dEmbed.h
@@ -15,6 +15,7 @@
 #ifndef P3DEMBED_H
 #define P3DEMBED_H
 
+#include "dtoolbase.h"
 #ifdef _WIN32
 #include <winsock2.h>
 #endif
diff --git a/direct/src/plugin_standalone/panda3d.h b/direct/src/plugin_standalone/panda3d.h
index 0d374026a6..36603b93e6 100755
--- a/direct/src/plugin_standalone/panda3d.h
+++ b/direct/src/plugin_standalone/panda3d.h
@@ -15,11 +15,11 @@
 #ifndef PANDA3D_H
 #define PANDA3D_H
 
+#include "dtoolbase.h"
 #ifdef _WIN32
 #include <winsock2.h>
 #endif
 
-
 #include "panda3dBase.h"
 #include "p3d_plugin.h"
 #include "httpChannel.h"
diff --git a/direct/src/plugin_standalone/panda3dBase.cxx b/direct/src/plugin_standalone/panda3dBase.cxx
index c4f565871d..5f4ebba30d 100644
--- a/direct/src/plugin_standalone/panda3dBase.cxx
+++ b/direct/src/plugin_standalone/panda3dBase.cxx
@@ -12,6 +12,7 @@
 //
 ////////////////////////////////////////////////////////////////////
 
+#include "dtoolbase.h"
 #ifdef _WIN32
 #include <winsock2.h>
 #include <windows.h>