diff --git a/contrib/fuzzystrmatch/fuzzystrmatch.sql.in b/contrib/fuzzystrmatch/fuzzystrmatch.sql.in
index 3dc2888f40a..8664d88c60d 100644
--- a/contrib/fuzzystrmatch/fuzzystrmatch.sql.in
+++ b/contrib/fuzzystrmatch/fuzzystrmatch.sql.in
@@ -19,4 +19,4 @@ LANGUAGE 'C' WITH (iscachable, isstrict);
 
 CREATE FUNCTION text_soundex(text) RETURNS text
 AS 'MODULE_PATHNAME', 'soundex'
-LANGUAGE 'C';
+LANGUAGE 'C' WITH (iscachable, isstrict);