diff --git a/include/wx/cmdline.h b/include/wx/cmdline.h
index 7533160c83..38299e1468 100644
--- a/include/wx/cmdline.h
+++ b/include/wx/cmdline.h
@@ -27,6 +27,7 @@ enum wxCmdLineSplitType
 
 #if wxUSE_CMDLINE_PARSER
 
+class WXDLLIMPEXP_FWD_BASE wxCmdLineParser
 class WXDLLIMPEXP_FWD_BASE wxDateTime;
 
 // ----------------------------------------------------------------------------