diff --git a/kernel/src/process/structs.rs b/kernel/src/process/structs.rs
index a8b0b63..06cb0b7 100644
--- a/kernel/src/process/structs.rs
+++ b/kernel/src/process/structs.rs
@@ -158,15 +158,12 @@ impl Thread {
     }
 
     /// Make a new user process from ELF `data`
-    pub fn new_user<'a, Iter>(
+    pub fn new_user(
         data: &[u8],
         exec_path: &str,
-        args: Iter,
+        mut args: Vec<String>,
         envs: Vec<String>,
-    ) -> Box<Thread>
-    where
-        Iter: Iterator<Item = &'a str>,
-    {
+    ) -> Box<Thread> {
         // Parse ELF
         let elf = ElfFile::new(data).expect("failed to read elf");
 
@@ -185,12 +182,11 @@ impl Thread {
                     debug!("using loader {}", &loader_path);
                     // Elf loader should not have INTERP
                     // No infinite loop
-                    let mut new_args: Vec<&str> = args.collect();
-                    new_args.insert(0, loader_path);
-                    new_args.insert(1, exec_path);
-                    new_args.remove(2);
-                    warn!("loader args: {:?}", new_args);
-                    return Thread::new_user(buf.as_slice(), exec_path, new_args.into_iter(), envs);
+                    args.insert(0, loader_path.into());
+                    args.insert(1, exec_path.into());
+                    args.remove(2);
+                    warn!("loader args: {:?}", args);
+                    return Thread::new_user(buf.as_slice(), exec_path, args, envs);
                 } else {
                     warn!("loader specified as {} but failed to read", &loader_path);
                 }
@@ -219,7 +215,7 @@ impl Thread {
 
         // Make init info
         let init_info = ProcInitInfo {
-            args: args.map(|s| String::from(s)).collect(),
+            args,
             envs,
             auxv: {
                 let mut map = BTreeMap::new();
diff --git a/kernel/src/shell.rs b/kernel/src/shell.rs
index 4c88786..fe8dc61 100644
--- a/kernel/src/shell.rs
+++ b/kernel/src/shell.rs
@@ -13,7 +13,7 @@ pub fn run_user_shell() {
         processor().manager().add(Thread::new_user(
             data.as_slice(),
             "rust/sh",
-            "sh".split(' '),
+            vec!["sh".into()],
             Vec::new(),
         ));
     } else {
@@ -28,7 +28,7 @@ pub fn run_user_shell() {
     let data = inode.read_as_vec().unwrap();
     processor().manager().add(Thread::new_user(
         data.as_slice(),
-        cmdline.split(' '),
+        cmdline.split(' ').map(|s| s.into()).collect(),
         Vec::new(),
     ));
 }
@@ -50,7 +50,7 @@ pub extern "C" fn shell(_arg: usize) -> ! {
             let _pid = processor().manager().add(Thread::new_user(
                 data.as_slice(),
                 &cmd,
-                cmd.split(' '),
+                cmd.split(' ').map(|s| s.into()).collect(),
                 Vec::new(),
             ));
         // TODO: wait until process exits, or use user land shell completely
diff --git a/kernel/src/syscall/proc.rs b/kernel/src/syscall/proc.rs
index 7e68948..9f3c97c 100644
--- a/kernel/src/syscall/proc.rs
+++ b/kernel/src/syscall/proc.rs
@@ -176,8 +176,7 @@ pub fn sys_exec(
     let buf = inode.read_as_vec()?;
 
     // Make new Thread
-    let args_iter = args.iter().map(|s| s.as_str());
-    let mut thread = Thread::new_user(buf.as_slice(), exec_path, args_iter, envs);
+    let mut thread = Thread::new_user(buf.as_slice(), exec_path, args, envs);
     thread.proc.lock().clone_for_exec(&proc);
 
     // Activate new page table