diff --git a/tests/testthat/test-io.R b/tests/testthat/test-io.R
index 0ad9a9a51..1e7931d53 100644
--- a/tests/testthat/test-io.R
+++ b/tests/testthat/test-io.R
@@ -9,7 +9,7 @@ test_that("non-ASCII characters are handled properly for file styling", {
   skip_if(.Platform$OS.type != "windows")
 
   withr::with_locale(
-    c("LC_CTYPE" = "English_United States.932"),
+    c("LC_CTYPE" = "English_United States.65001"),
     {
       tmp <- tempfile(fileext = ".R")
       con <- file(tmp, encoding = "UTF-8")