diff --git a/include/compat/pthread.h b/include/compat/pthread.h
index 223ad83..1ab011c 100755
--- a/include/compat/pthread.h
+++ b/include/compat/pthread.h
@@ -106,6 +106,7 @@ static inline int
 pthread_mutex_destroy(pthread_mutex_t *mutex)
 {
 	DeleteCriticalSection(mutex->lock);
+	free(mutex->lock);
 	return 0;
 }