diff --git a/src/chroot/chroot.rs b/src/chroot/chroot.rs
index c88f3b35f..daa6795ec 100644
--- a/src/chroot/chroot.rs
+++ b/src/chroot/chroot.rs
@@ -95,8 +95,8 @@ pub fn uumain(args: Vec<String>) -> isize {
     set_context(&newroot, &opts);
 
     unsafe {
-        let executable = CString::from_slice(command[0].as_bytes()).as_slice_with_nul().as_ptr();
-        let mut command_parts: Vec<*const i8> = command.iter().map(|x| CString::from_slice(x.as_bytes()).as_slice_with_nul().as_ptr()).collect();
+        let executable = CString::from_slice(command[0].as_bytes()).as_bytes_with_nul().as_ptr();
+        let mut command_parts: Vec<*const i8> = command.iter().map(|x| CString::from_slice(x.as_bytes()).as_bytes_with_nul().as_ptr()).collect();
         command_parts.push(std::ptr::null());
         execvp(executable as *const libc::c_char, command_parts.as_ptr() as *mut *const libc::c_char) as isize
     }
@@ -131,7 +131,7 @@ fn enter_chroot(root: &Path) {
     let root_str = root.display();
     std::os::change_dir(root).unwrap();
     let err = unsafe {
-        chroot(CString::from_slice(b".").as_slice_with_nul().as_ptr() as *const libc::c_char)
+        chroot(CString::from_slice(b".").as_bytes_with_nul().as_ptr() as *const libc::c_char)
     };
     if err != 0 {
         crash!(1, "cannot chroot to {}: {}", root_str, strerror(err).as_slice())
diff --git a/src/common/c_types.rs b/src/common/c_types.rs
index 78fde5648..50fcb287e 100644
--- a/src/common/c_types.rs
+++ b/src/common/c_types.rs
@@ -134,7 +134,7 @@ pub fn get_pw_from_args(free: &Vec<String>) -> Option<c_passwd> {
         } else {
             let pw_pointer = unsafe {
                 let cstr = CString::from_slice(username.as_bytes());
-                getpwnam(cstr.as_slice_with_nul().as_ptr())
+                getpwnam(cstr.as_bytes_with_nul().as_ptr())
             };
             if !pw_pointer.is_null() {
                 Some(unsafe { read(pw_pointer) })
@@ -153,7 +153,7 @@ pub fn get_group(groupname: &str) -> Option<c_group> {
     } else {
         unsafe { 
             let cstr = CString::from_slice(groupname.as_bytes());
-            getgrnam(cstr.as_slice_with_nul().as_ptr() as *const c_char)
+            getgrnam(cstr.as_bytes_with_nul().as_ptr() as *const c_char)
         }
     };