diff --git a/Libraries/LibC/sys/types.h b/Libraries/LibC/sys/types.h
index 45c376dc010fc28b5e8b185693e3e8a3d272e871..2066f23dfcad62da64edfe5e887df9a2875fd173 100644
--- a/Libraries/LibC/sys/types.h
+++ b/Libraries/LibC/sys/types.h
@@ -65,7 +65,9 @@ typedef void* pthread_key_t;
 typedef void* pthread_once_t;
 typedef uint32_t pthread_mutex_t;
 typedef void* pthread_attr_t;
-typedef void* pthread_mutexattr_t;
+typedef struct __pthread_mutexattr_t {
+    int type;
+} pthread_mutexattr_t;
 
 typedef struct __pthread_cond_t {
     void* storage;
diff --git a/Libraries/LibPthread/pthread.cpp b/Libraries/LibPthread/pthread.cpp
index 6e43fe1281e89c988896683d1b4b76c79899bf9b..d3a54b8e69f07b2467ad503c5637eda67cfb4345 100644
--- a/Libraries/LibPthread/pthread.cpp
+++ b/Libraries/LibPthread/pthread.cpp
@@ -125,6 +125,17 @@ int pthread_mutex_unlock(pthread_mutex_t* mutex)
     return 0;
 }
 
+int pthread_mutexattr_init(pthread_mutexattr_t* attr)
+{
+    attr->type = PTHREAD_MUTEX_NORMAL;
+    return 0;
+}
+
+int pthread_mutexattr_destroy(pthread_mutexattr_t*)
+{
+    return 0;
+}
+
 int pthread_attr_init(pthread_attr_t* attributes)
 {
     auto* impl = new PthreadAttrImpl {};