diff --git a/editors/builtin.mac b/editors/builtin.mac
index aabce07f..eb615929 100644
--- a/editors/builtin.mac
+++ b/editors/builtin.mac
@@ -14,6 +14,7 @@
 %idefine %null(+)
 %idefine %pathsearch()
 %idefine %realpath()
+%idefine %selbits(+)
 %idefine %str(&+)
 %idefine %strcat(&&+)
 %idefine %strlen(&&)