diff --git a/src/proto.h b/src/proto.h
index 95fd81a..e894987 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -237,6 +237,7 @@
 #  include "vim9compile.pro"
 #  include "vim9execute.pro"
 #  include "vim9script.pro"
+#  include "vim9type.pro"
 # endif
 # include "window.pro"