diff --git a/src/core/threading/GOMutexLocker.h b/src/core/threading/GOMutexLocker.h
index ba07a215f..003b501a3 100644
--- a/src/core/threading/GOMutexLocker.h
+++ b/src/core/threading/GOMutexLocker.h
@@ -38,7 +38,7 @@ class GOMutexLocker {
 
   ~GOMutexLocker();
 
-  bool TryLock(const char *lockerInfo = NULL);
+  bool TryLock(const char *lockerInfo = nullptr);
 
   bool IsLocked() const { return m_IsLocked; }