diff --git a/sync/sync_mac.v b/sync/sync_mac.v
index 3e20102659..4f8f78fa35 100644
--- a/sync/sync_mac.v
+++ b/sync/sync_mac.v
@@ -9,11 +9,11 @@ struct Mutex {
 	mutex C.pthread_mutex_t
 }
 
-fn (m Mutex) lock() {
+pub fn (m Mutex) lock() {
 	C.pthread_mutex_lock(&m.mutex)
 }
 
-fn (m Mutex) unlock() {
+pub fn (m Mutex) unlock() {
 	C.pthread_mutex_unlock(&m.mutex)
 }