diff --git a/include/vlc_messages.h b/include/vlc_messages.h
index 20163184aadc89841a71ac27e4472862a2ae1e56..8ca7ff0c4a0f15faf7fb9d601df5ae4a81ca9cc1 100644
--- a/include/vlc_messages.h
+++ b/include/vlc_messages.h
@@ -33,9 +33,6 @@
 
 #include <stdarg.h>
 
-int vlc_mutex_lock(  vlc_mutex_t * ) ;
-int vlc_mutex_unlock(  vlc_mutex_t * ) ;
-
 /**
  * \defgroup messages Messages
  * This library provides basic functions for threads to interact with user