diff --git a/lib/posix/options/cond.c b/lib/posix/options/cond.c
index 8c81de5b2f6..d1fc231c94c 100644
--- a/lib/posix/options/cond.c
+++ b/lib/posix/options/cond.c
@@ -105,7 +105,7 @@ static int cond_wait(pthread_cond_t *cond, pthread_mutex_t *mu, const struct tim
 	}
 
 	if (abstime != NULL) {
-		timeout = K_MSEC(timespec_to_clock_timeoutms(cv->attr.clock, abstime));
+		timeout = K_MSEC(timespec_to_timeoutms(cv->attr.clock, abstime));
 	}
 
 	LOG_DBG("Waiting on cond %p with timeout %llx", cv, timeout.ticks);
diff --git a/lib/posix/options/mqueue.c b/lib/posix/options/mqueue.c
index 72244a1981d..0eef3f81ccf 100644
--- a/lib/posix/options/mqueue.c
+++ b/lib/posix/options/mqueue.c
@@ -264,7 +264,7 @@ int mq_timedsend(mqd_t mqdes, const char *msg_ptr, size_t msg_len,
 	}
 
 	return send_message(mqd, msg_ptr, msg_len,
-			    K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
+			    K_MSEC(timespec_to_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**
@@ -300,7 +300,7 @@ int mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
 	}
 
 	return receive_message(mqd, msg_ptr, msg_len,
-			       K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
+			       K_MSEC(timespec_to_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**
diff --git a/lib/posix/options/mutex.c b/lib/posix/options/mutex.c
index ff2efc7f655..52dec35d249 100644
--- a/lib/posix/options/mutex.c
+++ b/lib/posix/options/mutex.c
@@ -216,7 +216,7 @@ int pthread_mutex_timedlock(pthread_mutex_t *m,
 		return EINVAL;
 	}
 
-	return acquire_mutex(m, K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
+	return acquire_mutex(m, K_MSEC(timespec_to_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**
diff --git a/lib/posix/options/posix_clock.h b/lib/posix/options/posix_clock.h
index c0ebe66fde6..5ff56724541 100644
--- a/lib/posix/options/posix_clock.h
+++ b/lib/posix/options/posix_clock.h
@@ -22,8 +22,7 @@ static inline bool timespec_is_valid(const struct timespec *ts)
 	return (ts->tv_nsec >= 0) && (ts->tv_nsec < NSEC_PER_SEC);
 }
 
-uint32_t timespec_to_clock_timeoutms(clockid_t clock_id, const struct timespec *abstime);
-uint32_t timespec_to_timeoutms(const struct timespec *abstime);
+uint32_t timespec_to_timeoutms(clockid_t clock_id, const struct timespec *abstime);
 
 __syscall int __posix_clock_get_base(clockid_t clock_id, struct timespec *ts);
 
diff --git a/lib/posix/options/pthread.c b/lib/posix/options/pthread.c
index bc88ea29fe2..c505b8564bb 100644
--- a/lib/posix/options/pthread.c
+++ b/lib/posix/options/pthread.c
@@ -1154,8 +1154,8 @@ int pthread_timedjoin_np(pthread_t pthread, void **status, const struct timespec
 		return EINVAL;
 	}
 
-	return pthread_timedjoin_internal(
-		pthread, status, K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
+	return pthread_timedjoin_internal(pthread, status,
+					  K_MSEC(timespec_to_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**
diff --git a/lib/posix/options/rwlock.c b/lib/posix/options/rwlock.c
index 39404c9229f..b7eb21bd6be 100644
--- a/lib/posix/options/rwlock.c
+++ b/lib/posix/options/rwlock.c
@@ -211,7 +211,7 @@ int pthread_rwlock_timedrdlock(pthread_rwlock_t *rwlock,
 		return EINVAL;
 	}
 
-	if (read_lock_acquire(rwl, timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)) != 0U) {
+	if (read_lock_acquire(rwl, timespec_to_timeoutms(CLOCK_REALTIME, abstime)) != 0U) {
 		ret = ETIMEDOUT;
 	}
 
@@ -282,7 +282,7 @@ int pthread_rwlock_timedwrlock(pthread_rwlock_t *rwlock,
 		return EINVAL;
 	}
 
-	if (write_lock_acquire(rwl, timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)) != 0U) {
+	if (write_lock_acquire(rwl, timespec_to_timeoutms(CLOCK_REALTIME, abstime)) != 0U) {
 		ret = ETIMEDOUT;
 	}
 
diff --git a/lib/posix/options/semaphore.c b/lib/posix/options/semaphore.c
index 77a879a8cb9..55ac57c5cfd 100644
--- a/lib/posix/options/semaphore.c
+++ b/lib/posix/options/semaphore.c
@@ -166,7 +166,7 @@ int sem_timedwait(sem_t *semaphore, struct timespec *abstime)
 		return -1;
 	}
 
-	if (k_sem_take(semaphore, K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)))) {
+	if (k_sem_take(semaphore, K_MSEC(timespec_to_timeoutms(CLOCK_REALTIME, abstime)))) {
 		errno = ETIMEDOUT;
 		return -1;
 	}
diff --git a/lib/posix/options/timespec_to_timeout.c b/lib/posix/options/timespec_to_timeout.c
index a3373a9a7bf..d307efa736e 100644
--- a/lib/posix/options/timespec_to_timeout.c
+++ b/lib/posix/options/timespec_to_timeout.c
@@ -10,7 +10,7 @@
 #include <ksched.h>
 #include <zephyr/posix/time.h>
 
-uint32_t timespec_to_clock_timeoutms(clockid_t clock_id, const struct timespec *abstime)
+uint32_t timespec_to_timeoutms(clockid_t clock_id, const struct timespec *abstime)
 {
 	int64_t milli_secs, secs, nsecs;
 	struct timespec curtime;
@@ -27,8 +27,3 @@ uint32_t timespec_to_clock_timeoutms(clockid_t clock_id, const struct timespec *
 
 	return milli_secs;
 }
-
-uint32_t timespec_to_timeoutms(const struct timespec *abstime)
-{
-	return timespec_to_clock_timeoutms(CLOCK_MONOTONIC, abstime);
-}