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-rw-r--r--src/thread/pthread_mutex_consistent.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread/pthread_mutex_consistent.c b/src/thread/pthread_mutex_consistent.c
index 0db976ab..96b83b52 100644
--- a/src/thread/pthread_mutex_consistent.c
+++ b/src/thread/pthread_mutex_consistent.c
@@ -5,6 +5,6 @@ int pthread_mutex_consistent(pthread_mutex_t *m)
if (!(m->_m_type & 8)) return EINVAL;
if ((m->_m_lock & 0x7fffffff) != __pthread_self()->tid)
return EPERM;
- m->_m_type -= 8;
+ m->_m_type &= ~8U;
return 0;
}