diff --git a/samples/htlbox/htlbox.cpp b/samples/htlbox/htlbox.cpp
index 5b34dbb2fb..419def086c 100644
--- a/samples/htlbox/htlbox.cpp
+++ b/samples/htlbox/htlbox.cpp
@@ -37,6 +37,7 @@
     #include "wx/textctrl.h"
 
     #include "wx/dc.h"
+    #include "wx/icon.h"
 #endif
 
 #include "wx/colordlg.h"