diff --git a/src/test/regress/expected/pg15.out b/src/test/regress/expected/pg15.out
index 338e33c5c..e210ac6e3 100644
--- a/src/test/regress/expected/pg15.out
+++ b/src/test/regress/expected/pg15.out
@@ -1554,7 +1554,7 @@ CREATE DATABASE mydatabase
             CONNECTION LIMIT = 10
             ENCODING = 'UTF8'
             STRATEGY = 'wal_log'
-            LOCALE = 'en_US.utf8'
+            LOCALE = ''
             LC_COLLATE = 'en_US.utf8'
             LC_CTYPE = 'en_US.utf8'
             ICU_LOCALE = 'en_US.utf8'
@@ -1572,9 +1572,9 @@ FROM pg_database pd
 JOIN pg_authid pa ON pd.datdba = pa.oid
 join pg_tablespace pt on pd.dattablespace = pt.oid
 WHERE datname = 'mydatabase';
-  datname   | encoding | datlocprovider | datistemplate | datallowconn | datconnlimit | datcollate  |  datctype   | daticulocale | datcollversion | datacl |      database_owner      |      database_owner      |        tablespace
+  datname   | encoding | datlocprovider | datistemplate | datallowconn | datconnlimit | datcollate |  datctype  | daticulocale | datcollversion | datacl |      database_owner      |      database_owner      |        tablespace
 ---------------------------------------------------------------------
- mydatabase |        6 | i              | f             | t            |           10 | en_US.utf8 | en_US.utf8 | en_US.utf8  | 1.0            |        | create_drop_db_test_user | create_drop_db_test_user | create_drop_db_tablespace
+ mydatabase |        6 | i              | f             | t            |           10 | en_US.utf8 | en_US.utf8 | en_US.utf8   | 1.0            |        | create_drop_db_test_user | create_drop_db_test_user | create_drop_db_tablespace
 (1 row)
 
 \c - - - :worker_1_port
@@ -1586,9 +1586,9 @@ FROM pg_database pd
 JOIN pg_authid pa ON pd.datdba = pa.oid
 join pg_tablespace pt on pd.dattablespace = pt.oid
 WHERE datname = 'mydatabase';
-  datname   | encoding | datlocprovider | datistemplate | datallowconn | datconnlimit | datcollate  |  datctype   | daticulocale | datcollversion | datacl |      database_owner      |      database_owner      |        tablespace
+  datname   | encoding | datlocprovider | datistemplate | datallowconn | datconnlimit | datcollate |  datctype  | daticulocale | datcollversion | datacl |      database_owner      |      database_owner      |        tablespace
 ---------------------------------------------------------------------
- mydatabase |        6 | i              | f             | t            |           10 | en_US.utf8 | en_US.utf8 | en_US.utf8  | 1.0            |        | create_drop_db_test_user | create_drop_db_test_user | create_drop_db_tablespace
+ mydatabase |        6 | i              | f             | t            |           10 | en_US.utf8 | en_US.utf8 | en_US.utf8   | 1.0            |        | create_drop_db_test_user | create_drop_db_test_user | create_drop_db_tablespace
 (1 row)
 
 \c - - - :worker_2_port
@@ -1600,9 +1600,9 @@ FROM pg_database pd
 JOIN pg_authid pa ON pd.datdba = pa.oid
 join pg_tablespace pt on pd.dattablespace = pt.oid
 WHERE datname = 'mydatabase';
-  datname   | encoding | datlocprovider | datistemplate | datallowconn | datconnlimit | datcollate  |  datctype   | daticulocale | datcollversion | datacl |      database_owner      |      database_owner      |        tablespace
+  datname   | encoding | datlocprovider | datistemplate | datallowconn | datconnlimit | datcollate |  datctype  | daticulocale | datcollversion | datacl |      database_owner      |      database_owner      |        tablespace
 ---------------------------------------------------------------------
- mydatabase |        6 | i              | f             | t            |           10 | en_US.utf8 | en_US.utf8 | en_US.utf8  | 1.0            |        | create_drop_db_test_user | create_drop_db_test_user | create_drop_db_tablespace
+ mydatabase |        6 | i              | f             | t            |           10 | en_US.utf8 | en_US.utf8 | en_US.utf8   | 1.0            |        | create_drop_db_test_user | create_drop_db_test_user | create_drop_db_tablespace
 (1 row)
 
 \c - - - :master_port
@@ -1653,4 +1653,4 @@ drop tablespace create_drop_db_tablespace;
 \c - - - :worker_2_port
 drop tablespace create_drop_db_tablespace;
 \c - - - :master_port
-drop user create_drop_db_test_user;
+drop user create_drop_db_test_user;
\ No newline at end of file
diff --git a/src/test/regress/sql/pg15.sql b/src/test/regress/sql/pg15.sql
index 1c1936dfc..3fc4cf0b2 100644
--- a/src/test/regress/sql/pg15.sql
+++ b/src/test/regress/sql/pg15.sql
@@ -1001,7 +1001,7 @@ CREATE DATABASE mydatabase
             CONNECTION LIMIT = 10
             ENCODING = 'UTF8'
             STRATEGY = 'wal_log'
-            LOCALE = 'en_US.utf8'
+            LOCALE = ''
             LC_COLLATE = 'en_US.utf8'
             LC_CTYPE = 'en_US.utf8'
             ICU_LOCALE = 'en_US.utf8'