diff --git a/src/arch.rs b/src/arch.rs
index 98943d3..cf71fa0 100644
--- a/src/arch.rs
+++ b/src/arch.rs
@@ -66,7 +66,7 @@ pub fn initialise_call_frame(stack: &mut Stack, init: uintptr_t, args: &[uintptr
     .. Registers::new()
   };
 
-  match into_fields!(regs { rdi, r13, r14, r15 } <- args.iter()) {
+  match into_fields!(regs { rdi, r13, r14, r15 } <- args.iter().cloned()) {
     Some(mut args) => if args.next().is_some() {
       panic!("too many arguments")
     },
diff --git a/src/macros.rs b/src/macros.rs
index 403560b..a4d0fdb 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -2,7 +2,7 @@ macro_rules! __into_fields {
   ($x:ident { $field:ident } <- $iter:ident) => {
     match $iter.next() {
       Some(value) => {
-        $x.$field = *value;
+        $x.$field = value;
         Some($iter)
       }
       None => None
@@ -11,7 +11,7 @@ macro_rules! __into_fields {
   ($x:ident { $field:ident, $($fields_rest:ident),* } <- $iter:ident) => {
     match $iter.next() {
       Some(value) => {
-        $x.$field = *value;
+        $x.$field = value;
         __into_fields!($x { $($fields_rest),* } <- $iter)
       }
       None => None