diff --git a/install/stringnames.txt b/install/stringnames.txt
index b0ac9c74016..1c434776a46 100644
--- a/install/stringnames.txt
+++ b/install/stringnames.txt
@@ -135,6 +135,7 @@ skipdbencodingtest
 status
 this_direction
 thischarset
+thisdirection
 thislanguage
 unicoderecommended
 unicoderequired