diff --git a/src/ticker/signal/timer.rs b/src/ticker/signal/timer.rs
index bcd838d..878c97d 100644
--- a/src/ticker/signal/timer.rs
+++ b/src/ticker/signal/timer.rs
@@ -1,26 +1,7 @@
-use std::os::raw::c_int;
 use std::ptr::null_mut;
 use std::time::{Duration, Instant};
 
-#[repr(C)]
-#[derive(Clone)]
-struct Timeval {
-    pub tv_sec: i64,
-    pub tv_usec: i64,
-}
-
-#[repr(C)]
-#[derive(Clone)]
-struct Itimerval {
-    pub it_interval: Timeval,
-    pub it_value: Timeval,
-}
-
-extern "C" {
-    fn setitimer(which: c_int, new_value: *mut Itimerval, old_value: *mut Itimerval) -> c_int;
-}
-
-const ITIMER_PROF: c_int = 2;
+use libc::{itimerval, setitimer, timeval, ITIMER_PROF};
 
 pub struct Timer {
     pub start_instant: Instant,
@@ -30,16 +11,16 @@ impl Timer {
     pub fn new(frequency: u32) -> Timer {
         let time = 1f64 / f64::from(frequency);
         let duration = Duration::from_secs_f64(time);
-        let it_interval = Timeval {
+        let it_interval = timeval {
             tv_sec: duration.as_secs().try_into().unwrap(),
-            tv_usec: duration.subsec_micros().into(),
+            tv_usec: duration.subsec_micros() as _,
         };
-        let it_value = it_interval.clone();
+        let it_value = it_interval;
 
         unsafe {
             setitimer(
                 ITIMER_PROF,
-                &mut Itimerval {
+                &itimerval {
                     it_interval,
                     it_value,
                 },
@@ -59,15 +40,15 @@ impl Timer {
 
 impl Drop for Timer {
     fn drop(&mut self) {
-        let it_interval = Timeval {
+        let it_interval = timeval {
             tv_sec: 0,
             tv_usec: 0,
         };
-        let it_value = it_interval.clone();
+        let it_value = it_interval;
         unsafe {
             setitimer(
                 ITIMER_PROF,
-                &mut Itimerval {
+                &itimerval {
                     it_interval,
                     it_value,
                 },