diff --git a/src/header/bits_timespec/mod.rs b/src/header/bits_timespec/mod.rs
index cd8539f21a..9bc6a5d5ee 100644
--- a/src/header/bits_timespec/mod.rs
+++ b/src/header/bits_timespec/mod.rs
@@ -16,7 +16,7 @@ impl timespec {
 
     /// similar logic with timeradd
     #[allow(clippy::should_implement_trait)] // not to confuse std::ops::Add
-    pub fn add(base: timespec, interval: timespec) -> Option<timespec> {
+    pub fn add(base: &timespec, interval: &timespec) -> Option<timespec> {
         let delta_sec = base.tv_sec.checked_add(interval.tv_sec)?;
         let delta_nsec = base.tv_nsec.checked_add(interval.tv_nsec)?;
 
@@ -30,7 +30,7 @@ impl timespec {
         })
     }
     /// similar logic with timersub
-    pub fn subtract(later: timespec, earlier: timespec) -> Option<timespec> {
+    pub fn subtract(later: &timespec, earlier: &timespec) -> Option<timespec> {
         let delta_sec = later.tv_sec.checked_sub(earlier.tv_sec)?;
         let delta_nsec = later.tv_nsec.checked_sub(earlier.tv_nsec)?;
 
diff --git a/src/header/pthread/mutex.rs b/src/header/pthread/mutex.rs
index 9f53257dbf..67c802aeef 100644
--- a/src/header/pthread/mutex.rs
+++ b/src/header/pthread/mutex.rs
@@ -76,7 +76,7 @@ pub unsafe extern "C" fn pthread_mutex_timedlock(
     mutex: *mut pthread_mutex_t,
     abstime: &timespec,
 ) -> c_int {
-    let relative = match timespec_realtime_to_monotonic(abstime.clone()) {
+    let relative = match timespec_realtime_to_monotonic(abstime) {
         Ok(relative) => relative,
         Err(err) => return e(Err(err)),
     };
diff --git a/src/header/time/mod.rs b/src/header/time/mod.rs
index 36f02d6ff6..fe0b1b66fe 100644
--- a/src/header/time/mod.rs
+++ b/src/header/time/mod.rs
@@ -882,15 +882,15 @@ const fn blank_tm() -> tm {
     }
 }
 
-pub(crate) fn timespec_realtime_to_monotonic(abstime: timespec) -> Result<timespec, Errno> {
+pub(crate) fn timespec_realtime_to_monotonic(abstime: &timespec) -> Result<timespec, Errno> {
     let mut realtime = timespec::default();
     unsafe { clock_gettime(CLOCK_REALTIME, &raw mut realtime) };
     let mut monotonic = timespec::default();
     unsafe { clock_gettime(CLOCK_MONOTONIC, &raw mut monotonic) };
-    let Some(delta) = timespec::subtract(abstime, realtime) else {
+    let Some(delta) = timespec::subtract(abstime, &realtime) else {
         return Err(Errno(ETIMEDOUT));
     };
-    let Some(relative) = timespec::add(monotonic, delta) else {
+    let Some(relative) = timespec::add(&monotonic, &delta) else {
         return Err(Errno(ENOMEM));
     };
     Ok(relative)
diff --git a/src/platform/redox/mod.rs b/src/platform/redox/mod.rs
index 068b7c1d6b..323bfdbf19 100644
--- a/src/platform/redox/mod.rs
+++ b/src/platform/redox/mod.rs
@@ -1354,7 +1354,7 @@ impl Pal for Sys {
         Self::clock_gettime(timer_st.clockid, Out::from_mut(&mut now))?;
 
         if timer_st.evp.sigev_notify == SIGEV_NONE {
-            if timespec::subtract(timer_st.next_wake_time.it_value.clone(), now.clone()).is_none() {
+            if timespec::subtract(&timer_st.next_wake_time.it_value, &now).is_none() {
                 // error here means the timer is disarmed
                 let _ = timer_update_wake_time(timer_st);
             }
@@ -1366,7 +1366,7 @@ impl Pal for Sys {
         } else {
             itimerspec {
                 it_interval: timer_st.next_wake_time.it_interval.clone(),
-                it_value: timespec::subtract(timer_st.next_wake_time.it_value.clone(), now)
+                it_value: timespec::subtract(&timer_st.next_wake_time.it_value, &now)
                     .unwrap_or_default(),
             }
         });
@@ -1392,7 +1392,7 @@ impl Pal for Sys {
             if flags & TIMER_ABSTIME == 0 {
                 let mut now = timespec::default();
                 Self::clock_gettime(timer_st.clockid, Out::from_mut(&mut now))?;
-                val.it_value = timespec::add(now, val.it_value).ok_or(Errno(EINVAL))?;
+                val.it_value = timespec::add(&now, &val.it_value).ok_or(Errno(EINVAL))?;
             }
             val
         };
diff --git a/src/platform/redox/timer.rs b/src/platform/redox/timer.rs
index 85063fc03b..fccd059cc3 100644
--- a/src/platform/redox/timer.rs
+++ b/src/platform/redox/timer.rs
@@ -86,7 +86,7 @@ pub(crate) fn timer_update_wake_time(timer_st: &mut timer_internal_t) -> Result<
     } else {
         let mut now = timespec::default();
         Sys::clock_gettime(timer_st.clockid, Out::from_mut(&mut now))?;
-        let next_time = match timespec::add(now, timer_st.next_wake_time.it_interval.clone()) {
+        let next_time = match timespec::add(&now, &timer_st.next_wake_time.it_interval) {
             Some(a) => a,
             None => timespec::default(),
         };
diff --git a/src/sync/cond.rs b/src/sync/cond.rs
index 19f9868a19..fd29aa91b2 100644
--- a/src/sync/cond.rs
+++ b/src/sync/cond.rs
@@ -73,7 +73,7 @@ impl Cond {
         let relative = match clock_id {
             // FUTEX expect monotonic clock
             CLOCK_MONOTONIC => timeout.clone(),
-            CLOCK_REALTIME => timespec_realtime_to_monotonic(timeout.clone())?,
+            CLOCK_REALTIME => timespec_realtime_to_monotonic(timeout)?,
             _ => return Err(Errno(EINVAL)),
         };
 
diff --git a/src/sync/rwlock.rs b/src/sync/rwlock.rs
index c93fe05dc9..73b367a3db 100644
--- a/src/sync/rwlock.rs
+++ b/src/sync/rwlock.rs
@@ -38,9 +38,7 @@ impl InnerRwLock {
         let relative = match deadline {
             // FUTEX expect monotonic clock
             Some((abstime, CLOCK_MONOTONIC)) => Some(abstime.clone()),
-            Some((abstime, CLOCK_REALTIME)) => {
-                Some(timespec_realtime_to_monotonic(abstime.clone())?)
-            }
+            Some((abstime, CLOCK_REALTIME)) => Some(timespec_realtime_to_monotonic(abstime)?),
             None => None,
             _ => {
                 return Err(Errno(EINVAL));
diff --git a/src/sync/semaphore.rs b/src/sync/semaphore.rs
index ce1496188a..8052bfaaa2 100644
--- a/src/sync/semaphore.rs
+++ b/src/sync/semaphore.rs
@@ -66,7 +66,7 @@ impl Semaphore {
                 let relative = match clock_id {
                     // FUTEX expect monotonic clock
                     CLOCK_MONOTONIC => timeout.clone(),
-                    CLOCK_REALTIME => match timespec_realtime_to_monotonic(timeout.clone()) {
+                    CLOCK_REALTIME => match timespec_realtime_to_monotonic(timeout) {
                         Ok(relative) => relative,
                         Err(_) => return Err(()),
                     },