diff --git a/engine/joint/v4k.h b/engine/joint/v4k.h
index 084f552..057b76f 100644
--- a/engine/joint/v4k.h
+++ b/engine/joint/v4k.h
@@ -335461,11 +335461,13 @@ int cook_async( void *userdata ) {
 
     // tcc: only a single running thread shall pass, because of racing shared state due to missing thread_local support at compiler level
     ifdef(tcc, thread_mutex_lock( job->lock ));
+    ifdef(osx, thread_mutex_lock( job->lock ));
 
     int ret = cook(userdata);
 
     // tcc: only a single running thread shall pass, because of racing shared state due to missing thread_local support at compiler level
     ifdef(tcc, thread_mutex_unlock( job->lock ));
+    ifdef(osx, thread_mutex_unlock( job->lock ));
 
     thread_exit( ret );
     return ret;
diff --git a/engine/split/v4k_cooker.c b/engine/split/v4k_cooker.c
index 7f1e5a0..1bf843e 100644
--- a/engine/split/v4k_cooker.c
+++ b/engine/split/v4k_cooker.c
@@ -581,11 +581,13 @@ int cook_async( void *userdata ) {
 
     // tcc: only a single running thread shall pass, because of racing shared state due to missing thread_local support at compiler level
     ifdef(tcc, thread_mutex_lock( job->lock ));
+    ifdef(osx, thread_mutex_lock( job->lock ));
 
     int ret = cook(userdata);
 
     // tcc: only a single running thread shall pass, because of racing shared state due to missing thread_local support at compiler level
     ifdef(tcc, thread_mutex_unlock( job->lock ));
+    ifdef(osx, thread_mutex_unlock( job->lock ));
 
     thread_exit( ret );
     return ret;
diff --git a/engine/v4k.c b/engine/v4k.c
index 27d2ff1..6fa9995 100644
--- a/engine/v4k.c
+++ b/engine/v4k.c
@@ -4393,11 +4393,13 @@ int cook_async( void *userdata ) {
 
     // tcc: only a single running thread shall pass, because of racing shared state due to missing thread_local support at compiler level
     ifdef(tcc, thread_mutex_lock( job->lock ));
+    ifdef(osx, thread_mutex_lock( job->lock ));
 
     int ret = cook(userdata);
 
     // tcc: only a single running thread shall pass, because of racing shared state due to missing thread_local support at compiler level
     ifdef(tcc, thread_mutex_unlock( job->lock ));
+    ifdef(osx, thread_mutex_unlock( job->lock ));
 
     thread_exit( ret );
     return ret;