diff --git a/src/fold/fold.rs b/src/fold/fold.rs
index 200951676..5b8da31cd 100644
--- a/src/fold/fold.rs
+++ b/src/fold/fold.rs
@@ -156,7 +156,7 @@ fn fold_file<T: Read>(mut file: BufReader<T>, bytes: bool, spaces: bool, width:
                                         let ncount = routput.chars().fold(0, |out, ch: char| {
                                             out + match ch {
                                                 '\t' => 8,
-                                                '\x08' => if out > 0 { -1 } else { 0 },
+                                                '\x08' => if out > 0 { !0 } else { 0 },
                                                 '\r' => return 0,
                                                 _ => 1
                                             }
diff --git a/src/stdbuf/stdbuf.rs b/src/stdbuf/stdbuf.rs
index 0be155afa..0024ef72d 100644
--- a/src/stdbuf/stdbuf.rs
+++ b/src/stdbuf/stdbuf.rs
@@ -231,7 +231,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
     for i in 1 .. args.len()+1 {
         match parse_options(&args[1 .. i], &mut options, &opts) {
             Ok(OkMsg::Buffering) => {
-                command_idx = i - 1;
+                command_idx = (i as i32) - 1;
                 break;
             },
             Ok(OkMsg::Help) => {
@@ -249,10 +249,10 @@ pub fn uumain(args: Vec<String>) -> i32 {
     if command_idx == -1 {
         crash!(125, "Invalid options\nTry 'stdbuf --help' for more information.");
     }
-    let ref command_name = args[command_idx];
+    let ref command_name = args[command_idx as usize];
     let mut command = Command::new(command_name);
     let (preload_env, libstdbuf) = get_preload_env();
-    command.args(&args[command_idx + 1 ..]).env(preload_env, libstdbuf);
+    command.args(&args[(command_idx as usize)+ 1 ..]).env(preload_env, libstdbuf);
     set_command_env(&mut command, "_STDBUF_I", options.stdin);
     set_command_env(&mut command, "_STDBUF_O", options.stdout);
     set_command_env(&mut command, "_STDBUF_E", options.stderr);