diff --git a/libs/pbd/pbd/semaphore.h b/libs/pbd/pbd/semaphore.h
index 51e0ae409d..e54063a15a 100644
--- a/libs/pbd/pbd/semaphore.h
+++ b/libs/pbd/pbd/semaphore.h
@@ -148,7 +148,7 @@ Semaphore::wait()
 inline bool
 Semaphore::try_wait()
 {
-	return WaitForSingleObject(sem->sem, 0) == WAIT_OBJECT_0;
+	return WaitForSingleObject(_sem, 0) == WAIT_OBJECT_0;
 }
 
 #else  /* !defined(__APPLE__) && !defined(_WIN32) */