diff --git a/contrib/citext/expected/citext.out b/contrib/citext/expected/citext.out
index 56fb0e9036..ff0a6ed588 100644
--- a/contrib/citext/expected/citext.out
+++ b/contrib/citext/expected/citext.out
@@ -1,6 +1,8 @@
 --
 --  Test citext datatype
 --
+--- script setup
+set client_encoding = 'utf8';
 CREATE EXTENSION citext;
 -- Check whether any of our opclasses fail amvalidate
 SELECT amname, opcname
diff --git a/contrib/citext/expected/citext_1.out b/contrib/citext/expected/citext_1.out
index 95549c5888..43a609b066 100644
--- a/contrib/citext/expected/citext_1.out
+++ b/contrib/citext/expected/citext_1.out
@@ -1,6 +1,8 @@
 --
 --  Test citext datatype
 --
+--- script setup
+set client_encoding = 'utf8';
 CREATE EXTENSION citext;
 -- Check whether any of our opclasses fail amvalidate
 SELECT amname, opcname
diff --git a/contrib/citext/sql/citext.sql b/contrib/citext/sql/citext.sql
index e9acd4664f..91dd7d03d0 100644
--- a/contrib/citext/sql/citext.sql
+++ b/contrib/citext/sql/citext.sql
@@ -2,6 +2,9 @@
 --  Test citext datatype
 --
 
+--- script setup
+set client_encoding = 'utf8';
+
 CREATE EXTENSION citext;
 
 -- Check whether any of our opclasses fail amvalidate