diff --git a/src/proto.h b/src/proto.h
index 50e64b4..cff55c3 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -136,6 +136,7 @@
 # include "regexp.pro"
 # include "screen.pro"
 # include "search.pro"
+# include "spell.pro"
 # include "syntax.pro"
 # include "tag.pro"
 # include "term.pro"