diff --git a/tool/phrase_substitutions.yaml b/tool/phrase_substitutions.yaml
index c6300540ad..c28733d0a3 100644
--- a/tool/phrase_substitutions.yaml
+++ b/tool/phrase_substitutions.yaml
@@ -57,7 +57,6 @@ it is essential: must, need to
 it is requested: please, we request, I request
 limited number: limits
 not later than: by, before
-not later than: by
 pertaining to: about, of, on
 prior to: before
 provided that: if