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Diffstat (limited to 'src/thread/pthread_mutex_lock.c')
-rw-r--r--src/thread/pthread_mutex_lock.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/thread/pthread_mutex_lock.c b/src/thread/pthread_mutex_lock.c
index 42b5af64..2a9a3aa4 100644
--- a/src/thread/pthread_mutex_lock.c
+++ b/src/thread/pthread_mutex_lock.c
@@ -2,7 +2,8 @@
 
 int pthread_mutex_lock(pthread_mutex_t *m)
 {
-	if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_cas(&m->_m_lock, 0, EBUSY))
+	if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL
+	    && !a_cas(&m->_m_lock, 0, EBUSY))
 		return 0;
 
 	return pthread_mutex_timedlock(m, 0);