diff --git a/tests/sort.rs b/tests/sort.rs
index a12388378..5544290c8 100644
--- a/tests/sort.rs
+++ b/tests/sort.rs
@@ -8,45 +8,45 @@ static UTIL_NAME: &'static str = "sort";
 
 #[test]
 fn test_numeric_floats_and_ints() {
-    test_helper("numeric_floats_and_ints", &String::from("-n"));
+    test_helper("numeric_floats_and_ints", "-n");
 }
 
 #[test]
 fn test_numeric_floats() {
-    test_helper("numeric_floats", &String::from("-n"));
+    test_helper("numeric_floats", "-n");
 }
 
 #[test]
 fn test_numeric_unfixed_floats() {
-    test_helper("numeric_unfixed_floats", &String::from("-n"));
+    test_helper("numeric_unfixed_floats", "-n");
 }
 
 #[test]
 fn test_numeric_fixed_floats() {
-    test_helper("numeric_fixed_floats", &String::from("-n"));
+    test_helper("numeric_fixed_floats", "-n");
 }
 
 #[test]
 fn test_numeric_unsorted_ints() {
-    test_helper("numeric_unsorted_ints", &String::from("-n"));
+    test_helper("numeric_unsorted_ints", "-n");
 }
 
 #[test]
 fn test_human_block_sizes() {
-    test_helper("human_block_sizes", &String::from("-h"));
+    test_helper("human_block_sizes", "-h");
 }
 
 #[test]
 fn test_month_default() {
-    test_helper("month_default", &String::from("-M"));
+    test_helper("month_default", "-M");
 }
 
 #[test]
 fn test_default_unsorted_ints() {
-    test_helper("default_unsorted_ints", &String::from(""));
+    test_helper("default_unsorted_ints", "");
 }
 
-fn test_helper(file_name: &str, args: &String) {
+fn test_helper(file_name: &str, args: &str) {
     let (at, mut ucmd) = testing(UTIL_NAME);
     ucmd.arg(args);
     let out = ucmd.arg(format!("{}{}", file_name, ".txt")).run().stdout;