diff --git a/lib/libc/pthread/include/pthread.h b/lib/libc/pthread/include/pthread.h
index 02a9b42..43c2381 100644
--- a/lib/libc/pthread/include/pthread.h
+++ b/lib/libc/pthread/include/pthread.h
@@ -1,6 +1,8 @@
 #ifndef PTHREAD_H_
 #define PTHREAD_H_
 
+#include <mango/types.h>
+
 #define __PTHREAD_ATTR_SIZE__ 32
 
 typedef struct __pthread *pthread_t;
@@ -10,6 +12,10 @@ typedef struct __pthread_attr {
 	char __opaque[__PTHREAD_ATTR_SIZE__];
 } pthread_attr_t;
 
+typedef struct __pthread_mutex {
+	kern_futex_t __v;
+} pthread_mutex_t;
+
 extern int __pthread_init(void);
 
 extern int pthread_create(