diff --git a/main/lock.c b/main/lock.c
index e59259942b..f98837778b 100644
--- a/main/lock.c
+++ b/main/lock.c
@@ -32,6 +32,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #undef pthread_mutex_destroy
 #undef pthread_mutex_lock
 #undef pthread_mutex_trylock
+#undef pthread_mutex_t
 #undef pthread_mutex_unlock
 #undef pthread_cond_init
 #undef pthread_cond_signal