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-rw-r--r--c/src/exec/posix/src/mutexunlock.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/c/src/exec/posix/src/mutexunlock.c b/c/src/exec/posix/src/mutexunlock.c
index 3f5d5a03f3..3b6fdcc7e0 100644
--- a/c/src/exec/posix/src/mutexunlock.c
+++ b/c/src/exec/posix/src/mutexunlock.c
@@ -49,7 +49,7 @@ int pthread_mutex_unlock(
&the_mutex->Mutex,
the_mutex->Object.id,
#if defined(RTEMS_MULTIPROCESSING)
- POSIX_Threads_mutex_MP_support
+ _POSIX_Threads_mutex_MP_support
#else
NULL
#endif