diff --git a/include/bitmaps/bitmap_info.h.in b/include/bitmaps/bitmap_info.h.in
index 26c1139edb..688472f919 100644
--- a/include/bitmaps/bitmap_info.h.in
+++ b/include/bitmaps/bitmap_info.h.in
@@ -28,6 +28,8 @@
 #include <vector>
 #include <bitmaps/bitmaps_list.h>
 
+#include <wx/string.h> // wxT
+
 struct BITMAP_INFO
 {
     BITMAPS  id;