diff --git a/include/wx/propgrid/advprops.h b/include/wx/propgrid/advprops.h
index 626552887b..34306a3caf 100644
--- a/include/wx/propgrid/advprops.h
+++ b/include/wx/propgrid/advprops.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_ADVPROPS_H_
 #define _WX_PROPGRID_ADVPROPS_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 #include "wx/propgrid/props.h"
diff --git a/include/wx/propgrid/editors.h b/include/wx/propgrid/editors.h
index 9ec56b0abf..ebcc75808f 100644
--- a/include/wx/propgrid/editors.h
+++ b/include/wx/propgrid/editors.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_EDITORS_H_
 #define _WX_PROPGRID_EDITORS_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 // -----------------------------------------------------------------------
diff --git a/include/wx/propgrid/manager.h b/include/wx/propgrid/manager.h
index 997637479d..353ea114b4 100644
--- a/include/wx/propgrid/manager.h
+++ b/include/wx/propgrid/manager.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_MANAGER_H_
 #define _WX_PROPGRID_MANAGER_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 #include "wx/propgrid/propgrid.h"
diff --git a/include/wx/propgrid/property.h b/include/wx/propgrid/property.h
index da6e966f7b..5ef99831b9 100644
--- a/include/wx/propgrid/property.h
+++ b/include/wx/propgrid/property.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_PROPERTY_H_
 #define _WX_PROPGRID_PROPERTY_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 #include "wx/propgrid/propgriddefs.h"
diff --git a/include/wx/propgrid/propgrid.h b/include/wx/propgrid/propgrid.h
index d0340d40d4..94119d7d3e 100644
--- a/include/wx/propgrid/propgrid.h
+++ b/include/wx/propgrid/propgrid.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_PROPGRID_H_
 #define _WX_PROPGRID_PROPGRID_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 #include "wx/thread.h"
diff --git a/include/wx/propgrid/propgriddefs.h b/include/wx/propgrid/propgriddefs.h
index 4eedb900a7..8936b39b51 100644
--- a/include/wx/propgrid/propgriddefs.h
+++ b/include/wx/propgrid/propgriddefs.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_PROPGRIDDEFS_H_
 #define _WX_PROPGRID_PROPGRIDDEFS_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 #include "wx/dynarray.h"
diff --git a/include/wx/propgrid/propgridiface.h b/include/wx/propgrid/propgridiface.h
index 8aa26d070e..027a720c19 100644
--- a/include/wx/propgrid/propgridiface.h
+++ b/include/wx/propgrid/propgridiface.h
@@ -12,6 +12,8 @@
 #ifndef __WX_PROPGRID_PROPGRIDIFACE_H__
 #define __WX_PROPGRID_PROPGRIDIFACE_H__
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 #include "wx/propgrid/property.h"
diff --git a/include/wx/propgrid/propgridpagestate.h b/include/wx/propgrid/propgridpagestate.h
index 3f72dc92d4..a2d91f552a 100644
--- a/include/wx/propgrid/propgridpagestate.h
+++ b/include/wx/propgrid/propgridpagestate.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_PROPGRIDPAGESTATE_H_
 #define _WX_PROPGRID_PROPGRIDPAGESTATE_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 #include "wx/propgrid/property.h"
diff --git a/include/wx/propgrid/props.h b/include/wx/propgrid/props.h
index daa5462403..7ea887e3fe 100644
--- a/include/wx/propgrid/props.h
+++ b/include/wx/propgrid/props.h
@@ -12,6 +12,8 @@
 #ifndef _WX_PROPGRID_PROPS_H_
 #define _WX_PROPGRID_PROPS_H_
 
+#include "wx/defs.h"
+
 #if wxUSE_PROPGRID
 
 // -----------------------------------------------------------------------