diff --git a/include/tlist.h b/include/tlist.h
index 6735c9816..fe3d9a66c 100644
--- a/include/tlist.h
+++ b/include/tlist.h
@@ -284,8 +284,8 @@ static inline int32_t timerlist_add(struct timerlist *timerlist,
 	struct timerlist_timer **new_heap_entries;
 	int32_t res = 0;
 
-	if (pthread_mutex_lock(&timerlist->list_mutex)) {
-		return -errno;
+	if ( (res=pthread_mutex_lock(&timerlist->list_mutex))) {
+		return -res;
 	}
 
 	/*
@@ -351,9 +351,10 @@ static inline int32_t timerlist_del(struct timerlist *timerlist,
 				 timer_handle _timer_handle)
 {
 	struct timerlist_timer *timer = (struct timerlist_timer *)_timer_handle;
+	int res;
 
-	if (pthread_mutex_lock(&timerlist->list_mutex)) {
-		return -errno;
+	if ( (res=pthread_mutex_lock(&timerlist->list_mutex))) {
+		return -res;
 	}
 
 	memset(timer->handle_addr, 0, sizeof(struct timerlist_timer *));
@@ -453,12 +454,13 @@ static inline int32_t timerlist_expire(struct timerlist *timerlist)
 	uint64_t current_time_from_epoch;
 	uint64_t current_monotonic_time;
 	uint64_t current_time;
+	int res;
 
 	current_monotonic_time = qb_util_nano_current_get();
 	current_time_from_epoch = qb_util_nano_from_epoch_get();
 
-	if (pthread_mutex_lock(&timerlist->list_mutex)) {
-		return -errno;
+	if ( (res=pthread_mutex_lock(&timerlist->list_mutex))) {
+		return -res;
 	}
 
 	while (timerlist->size > 0) {
diff --git a/lib/loop_timerlist.c b/lib/loop_timerlist.c
index 59cb1a138..9aef348ad 100644
--- a/lib/loop_timerlist.c
+++ b/lib/loop_timerlist.c
@@ -187,6 +187,7 @@ qb_loop_timer_add(struct qb_loop * lp,
 	struct qb_loop_timer *t;
 	struct qb_timer_source *my_src;
 	int32_t i;
+	int res;
 	struct qb_loop *l = lp;
 
 	if (l == NULL) {
@@ -198,8 +199,8 @@ qb_loop_timer_add(struct qb_loop * lp,
 	}
 	my_src = (struct qb_timer_source *)l->timer_source;
 
-	if (pthread_mutex_lock(&my_src->lock)) {
-		return -errno;
+	if ( (res=pthread_mutex_lock(&my_src->lock))) {
+		return -res;
 	}
 	i = _get_empty_array_position_(my_src);
 	assert(qb_array_index(my_src->timers, i, (void **)&t) >= 0);
diff --git a/lib/rpl_sem.c b/lib/rpl_sem.c
index 7daeb4f2d..cb73f9d31 100644
--- a/lib/rpl_sem.c
+++ b/lib/rpl_sem.c
@@ -76,7 +76,7 @@ _rpl_sem_timedwait(rpl_sem_t * sem, const struct timespec *timeout)
 {
 	int retval = pthread_mutex_lock(&sem->mutex);
 	if (retval != 0) {
-		return -errno;
+		return -retval;
 	}
 	if (sem->destroy_request) {
 		retval = -EINVAL;