diff --git a/rtl/win/wininc/messages.inc b/rtl/win/wininc/messages.inc
index 01a9ac9a42..c02f9e59ac 100644
--- a/rtl/win/wininc/messages.inc
+++ b/rtl/win/wininc/messages.inc
@@ -90,6 +90,7 @@
      CB_DIR = 325;
      CB_FINDSTRING = 332;
      CB_FINDSTRINGEXACT = 344;
+     CB_GETCOMBOBOXINFO = 356;
      CB_GETCOUNT = 326;
      CB_GETCURSEL = 327;
      CB_GETDROPPEDCONTROLRECT = 338;