diff --git a/include/wx/tarstrm.h b/include/wx/tarstrm.h
index 0ade9f9a28..adb5cb7cbf 100644
--- a/include/wx/tarstrm.h
+++ b/include/wx/tarstrm.h
@@ -15,6 +15,7 @@
 #if wxUSE_TARSTREAM
 
 #include "wx/archive.h"
+#include "wx/hashmap.h"
 
 
 /////////////////////////////////////////////////////////////////////////////