diff --git a/tests/by-util/test_head.rs b/tests/by-util/test_head.rs
index a7a5a3b07..2d6d60d15 100755
--- a/tests/by-util/test_head.rs
+++ b/tests/by-util/test_head.rs
@@ -247,21 +247,21 @@ hello
 
 #[test]
 fn test_bad_utf8() {
-    let bytes = b"\xfc\x80\x80\x80\x80\xaf";
+    let bytes: &[u8] = b"\xfc\x80\x80\x80\x80\xaf";
     new_ucmd!()
         .args(&["-c", "6"])
-        .pipe_in(*bytes)
+        .pipe_in(bytes)
         .succeeds()
         .stdout_is_bytes(bytes);
 }
 
 #[test]
 fn test_bad_utf8_lines() {
-    let input = b"\xfc\x80\x80\x80\x80\xaf\nb\xfc\x80\x80\x80\x80\xaf\nb\xfc\x80\x80\x80\x80\xaf";
+    let input: &[u8] = b"\xfc\x80\x80\x80\x80\xaf\nb\xfc\x80\x80\x80\x80\xaf\nb\xfc\x80\x80\x80\x80\xaf";
     let output = b"\xfc\x80\x80\x80\x80\xaf\nb\xfc\x80\x80\x80\x80\xaf\n";
     new_ucmd!()
         .args(&["-n", "2"])
-        .pipe_in(*input)
+        .pipe_in(input)
         .succeeds()
         .stdout_is_bytes(output);
 }