diff --git a/panda/src/wgldisplay/wglGraphicsBuffer.cxx b/panda/src/wgldisplay/wglGraphicsBuffer.cxx
index def16d8b23..38550e29de 100644
--- a/panda/src/wgldisplay/wglGraphicsBuffer.cxx
+++ b/panda/src/wgldisplay/wglGraphicsBuffer.cxx
@@ -16,6 +16,7 @@
 #include "wglGraphicsPipe.h"
 #include "config_wgldisplay.h"
 #include "glgsg.h"
+#include "wglGraphicsStateGuardian.h"
 #include "pStatTimer.h"
 
 #include <wingdi.h>
diff --git a/panda/src/wgldisplay/wglGraphicsPipe.cxx b/panda/src/wgldisplay/wglGraphicsPipe.cxx
index fbfa17a339..a61819829b 100644
--- a/panda/src/wgldisplay/wglGraphicsPipe.cxx
+++ b/panda/src/wgldisplay/wglGraphicsPipe.cxx
@@ -17,6 +17,7 @@
 #include "config_windisplay.h"
 #include "wglGraphicsWindow.h"
 #include "wglGraphicsBuffer.h"
+#include "wglGraphicsStateGuardian.h"
 
 typedef enum {Software, MCD, ICD} OGLDriverType;
 
diff --git a/panda/src/wgldisplay/wglGraphicsStateGuardian.cxx b/panda/src/wgldisplay/wglGraphicsStateGuardian.cxx
index b4b9f5f157..575b79931d 100644
--- a/panda/src/wgldisplay/wglGraphicsStateGuardian.cxx
+++ b/panda/src/wgldisplay/wglGraphicsStateGuardian.cxx
@@ -13,7 +13,9 @@
 ////////////////////////////////////////////////////////////////////
 
 #include "wglGraphicsStateGuardian.h"
+#include "config_wgldisplay.h"
 #include "wglGraphicsBuffer.h"
+#include "wglGraphicsPipe.h"
 #include "string_utils.h"
 
 TypeHandle wglGraphicsStateGuardian::_type_handle;
diff --git a/panda/src/wgldisplay/wglGraphicsWindow.cxx b/panda/src/wgldisplay/wglGraphicsWindow.cxx
index 43a3d5a480..bf724f3a5f 100644
--- a/panda/src/wgldisplay/wglGraphicsWindow.cxx
+++ b/panda/src/wgldisplay/wglGraphicsWindow.cxx
@@ -18,6 +18,7 @@
 #include "wglGraphicsPipe.h"
 #include "pStatTimer.h"
 #include "glgsg.h"
+#include "wglGraphicsStateGuardian.h"
 
 #include <wingdi.h>