diff --git a/src/env/env.rs b/src/env/env.rs
index b8c739384..dec94d810 100644
--- a/src/env/env.rs
+++ b/src/env/env.rs
@@ -82,7 +82,7 @@ pub fn uumain(args: Vec<String>) -> int {
 
             match (name, value) {
                 (Some(n), Some(v)) => {
-                    opts.sets.push((n.into_string(), v.into_string()));
+                    opts.sets.push((n.to_string(), v.to_string()));
                 }
                 _ => {
                     // read the program now
@@ -154,7 +154,7 @@ pub fn uumain(args: Vec<String>) -> int {
             match (name, value) {
                 (Some(n), Some(v)) => {
                     // yes
-                    opts.sets.push((n.into_string(), v.into_string()));
+                    opts.sets.push((n.to_string(), v.to_string()));
                     wait_cmd = true;
                 }
                 // no, its a program-like opt
diff --git a/src/fold/fold.rs b/src/fold/fold.rs
index 721a31203..79bc76f96 100644
--- a/src/fold/fold.rs
+++ b/src/fold/fold.rs
@@ -172,7 +172,7 @@ fn fold_file<T: io::Reader>(file: BufferedReader<T>, bytes: bool, spaces: bool,
                                 (slice, "", 0)
                             };
                         println!("{}", out);
-                        (val.into_string(), ncount)
+                        (val.to_string(), ncount)
                     };
                     output = val;
                     count = ncount;
diff --git a/src/tac/tac.rs b/src/tac/tac.rs
index 57238c230..7211f3df5 100644
--- a/src/tac/tac.rs
+++ b/src/tac/tac.rs
@@ -81,10 +81,10 @@ fn tac(filenames: Vec<String>, before: bool, _: bool, separator: &str) {
         let mut data = crash_if_err!(1, file.read_to_string());
         if data.as_slice().ends_with("\n") {
             // removes blank line that is inserted otherwise
-            let mut buf = data.into_string();
+            let mut buf = data.to_string();
             let len = buf.len();
             buf.truncate(len - 1);
-            data = buf.into_string();
+            data = buf.to_string();
         }
         let split_vec: Vec<&str> = data.as_slice().split_str(separator).collect();
         let rev: String = split_vec.iter().rev().fold(String::new(), |mut a, &b| {
diff --git a/src/uniq/uniq.rs b/src/uniq/uniq.rs
index 626246bef..dc6b96953 100644
--- a/src/uniq/uniq.rs
+++ b/src/uniq/uniq.rs
@@ -66,7 +66,7 @@ impl Uniq {
                 Some(i) => min(slice_start + i, len),
                 None => len
             };
-            let sliced = line.as_slice().slice(slice_start, slice_stop).into_string();
+            let sliced = line.as_slice().slice(slice_start, slice_stop).to_string();
             if self.ignore_case {
                 sliced.into_ascii_uppercase()
             } else {
@@ -157,8 +157,8 @@ pub fn uumain(args: Vec<String>) -> int {
         println!("{} {}", NAME, VERSION);
     } else {
         let (in_file_name, out_file_name) = match matches.free.len() {
-            0 => ("-".into_string(), "-".into_string()),
-            1 => (matches.free[0].clone(), "-".into_string()),
+            0 => ("-".to_string(), "-".to_string()),
+            1 => (matches.free[0].clone(), "-".to_string()),
             2 => (matches.free[0].clone(), matches.free[1].clone()),
             _ => {
                 crash!(1, "Extra operand: {}", matches.free[2]);