1 files changed, 1 insertions, 1 deletions

diff --git a/src/threading.h b/src/threading.h
index 24e0998..608f916 100644
--- a/src/threading.h
+++ b/src/threading.h
@@ -114,7 +114,7 @@ enum e_status { PENDING, RUNNING, WAITING, DONE, ERROR_ST, CANCELLED };
   #endif
 
   #define MUTEX_T            pthread_mutex_t
-  #define MUTEX_INIT(ref)    pthread_mutex_init(ref,NULL)
+  #define MUTEX_INIT(ref)    pthread_mutex_init(ref, nullptr)
   #define MUTEX_RECURSIVE_INIT(ref) \
       { pthread_mutexattr_t a; pthread_mutexattr_init( &a ); \
         pthread_mutexattr_settype( &a, _MUTEX_RECURSIVE ); \