diff --git a/include/wx/proplist.h b/include/wx/proplist.h
index 21be88015a..5fdf1bdcce 100644
--- a/include/wx/proplist.h
+++ b/include/wx/proplist.h
@@ -49,6 +49,7 @@
 #if wxUSE_PROPSHEET
 
 #include "wx/prop.h"
+#include "wx/panel.h"
 
 #define wxPROP_BUTTON_CLOSE       1
 #define wxPROP_BUTTON_OK          2
diff --git a/include/wx/wizard.h b/include/wx/wizard.h
index 4a357556fc..3e36959f8d 100644
--- a/include/wx/wizard.h
+++ b/include/wx/wizard.h
@@ -22,6 +22,7 @@
 
 #ifndef WX_PRECOMP
     #include "wx/dialog.h"      // the base class
+    #include "wx/panel.h"       // ditto
 
     #include "wx/event.h"       // wxEVT_XXX constants
 #endif // WX_PRECOMP