1 files changed, 1 insertions, 1 deletions
diff --git a/mutex.c b/mutex.c
index d53c356..aaf4ff4 100644
--- a/mutex.c
+++ b/mutex.c
@@ -11,7 +11,7 @@
 #include "implement.h"
 
 int
-pthread_mutex_init(pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
+pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
 {
   if (mutex == NULL)
     {