diff --git a/src/test/regress/expected/collate.windows.win1252.out b/src/test/regress/expected/collate.windows.win1252.out
index b7b93959de..97cbfc86de 100644
--- a/src/test/regress/expected/collate.windows.win1252.out
+++ b/src/test/regress/expected/collate.windows.win1252.out
@@ -992,7 +992,13 @@ drop type textrange_c;
 drop type textrange_en_us;
 -- nondeterministic collations
 -- (not supported with libc provider)
-CREATE COLLATION ctest_det (locale = 'en_US', deterministic = true);
+do $$
+BEGIN
+  EXECUTE 'CREATE COLLATION ctest_det (locale = ' ||
+          quote_literal((SELECT collcollate FROM pg_collation WHERE
+          collname = 'en_US')) || ', deterministic = true);';
+  END
+$$;
 CREATE COLLATION ctest_nondet (locale = 'en_US', deterministic = false);
 ERROR:  nondeterministic collations not supported with this provider
 -- cleanup
diff --git a/src/test/regress/sql/collate.windows.win1252.sql b/src/test/regress/sql/collate.windows.win1252.sql
index 353d769a5b..727d136f2f 100644
--- a/src/test/regress/sql/collate.windows.win1252.sql
+++ b/src/test/regress/sql/collate.windows.win1252.sql
@@ -400,8 +400,13 @@ drop type textrange_en_us;
 
 -- nondeterministic collations
 -- (not supported with libc provider)
-
-CREATE COLLATION ctest_det (locale = 'en_US', deterministic = true);
+do $$
+BEGIN
+  EXECUTE 'CREATE COLLATION ctest_det (locale = ' ||
+          quote_literal((SELECT collcollate FROM pg_collation WHERE
+          collname = 'en_US')) || ', deterministic = true);';
+  END
+$$;
 CREATE COLLATION ctest_nondet (locale = 'en_US', deterministic = false);