diff --git a/tests/by-util/test_mktemp.rs b/tests/by-util/test_mktemp.rs
index 44221168c84..8b58672a2d6 100644
--- a/tests/by-util/test_mktemp.rs
+++ b/tests/by-util/test_mktemp.rs
@@ -42,6 +42,7 @@ macro_rules! assert_matches_template {
 }
 
 /// Like [`assert_matches_template`] but for the suffix of a string.
+#[cfg(windows)]
 macro_rules! assert_suffix_matches_template {
     ($template:expr, $s:expr) => {{
         let n = ($s).len();
@@ -699,10 +700,7 @@ fn test_tmpdir_env_var() {
     // * https://doc.rust-lang.org/std/env/fn.temp_dir.html
     // * https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-gettemppath2w
     #[cfg(windows)]
-    {
-        let template = "tmp.XXXXXXXXXX";
-        assert_suffix_matches_template!(&template, filename);
-    }
+    assert_suffix_matches_template!("tmp.XXXXXXXXXX", filename);
     assert!(at.file_exists(filename));
 
     // FIXME This is not working because --tmpdir is configured to
@@ -726,10 +724,7 @@ fn test_tmpdir_env_var() {
         assert_matches_template!(&template, filename);
     }
     #[cfg(windows)]
-    {
-        let template = "XXX";
-        assert_suffix_matches_template!(&template, filename);
-    }
+    assert_suffix_matches_template!("XXX", filename);
     assert!(at.file_exists(filename));
 
     // `TMPDIR=. mktemp XXX` - in this case `TMPDIR` is ignored.