diff --git a/headers/posix/pthread.h b/headers/posix/pthread.h
index 1a833a47fe..106838ecb2 100644
--- a/headers/posix/pthread.h
+++ b/headers/posix/pthread.h
@@ -44,7 +44,8 @@
 
 #define PTHREAD_ONCE_INIT 			{ -1 }
 
-#define PTHREAD_BARRIER_SERIAL_THREAD -1
+#define PTHREAD_BARRIER_SERIAL_THREAD 1
+
 #define PTHREAD_PRIO_NONE			0
 #define PTHREAD_PRIO_INHERIT		1
 #define PTHREAD_PRIO_PROTECT		2