1 files changed, 2 insertions, 2 deletions
diff --git a/common/mutex.h b/common/mutex.h
index 6e467cfddf..f965a63e0d 100644
--- a/common/mutex.h
+++ b/common/mutex.h
@@ -46,8 +46,8 @@ class StackLock {
 	void lock();
 	void unlock();
 public:
-	explicit StackLock(MutexRef mutex, const char *mutexName = NULL);
-	explicit StackLock(const Mutex &mutex, const char *mutexName = NULL);
+	explicit StackLock(MutexRef mutex, const char *mutexName = nullptr);
+	explicit StackLock(const Mutex &mutex, const char *mutexName = nullptr);
 	~StackLock();
 };