diff --git a/Userland/Libraries/LibC/sys/types.h b/Userland/Libraries/LibC/sys/types.h
index af1f4fb32ae..9ee36152ba3 100644
--- a/Userland/Libraries/LibC/sys/types.h
+++ b/Userland/Libraries/LibC/sys/types.h
@@ -99,7 +99,7 @@ typedef struct __pthread_cond_t {
 } pthread_cond_t;
 
 typedef void* pthread_rwlock_t;
-typedef void* pthread_rwlockatrr_t;
+typedef void* pthread_rwlockattr_t;
 typedef void* pthread_spinlock_t;
 typedef struct __pthread_condattr_t {
     int clockid; // clockid_t
diff --git a/Userland/Libraries/LibPthread/pthread.cpp b/Userland/Libraries/LibPthread/pthread.cpp
index b4b5240efa5..1dc878f210d 100644
--- a/Userland/Libraries/LibPthread/pthread.cpp
+++ b/Userland/Libraries/LibPthread/pthread.cpp
@@ -28,6 +28,8 @@
 #include <AK/Atomic.h>
 #include <AK/Debug.h>
 #include <AK/StdLibExtras.h>
+#include <Kernel/API/Syscall.h>
+#include <LibSystem/syscall.h>
 #include <limits.h>
 #include <pthread.h>
 #include <serenity.h>
@@ -683,4 +685,59 @@ int pthread_equal(pthread_t t1, pthread_t t2)
     return t1 == t2;
 }
 
+int pthread_rwlock_destroy(pthread_rwlock_t* rl)
+{
+    if (!rl)
+        return 0;
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_init(pthread_rwlock_t* __restrict, const pthread_rwlockattr_t* __restrict)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_rdlock(pthread_rwlock_t*)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_timedrdlock(pthread_rwlock_t* __restrict, const struct timespec* __restrict)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_timedwrlock(pthread_rwlock_t* __restrict, const struct timespec* __restrict)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_tryrdlock(pthread_rwlock_t*)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_trywrlock(pthread_rwlock_t*)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_unlock(pthread_rwlock_t*)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlock_wrlock(pthread_rwlock_t*)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlockattr_destroy(pthread_rwlockattr_t*)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t* __restrict, int* __restrict)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlockattr_init(pthread_rwlockattr_t*)
+{
+    ASSERT_NOT_REACHED();
+}
+int pthread_rwlockattr_setpshared(pthread_rwlockattr_t*, int)
+{
+    ASSERT_NOT_REACHED();
+}
+
 } // extern "C"
diff --git a/Userland/Libraries/LibPthread/pthread.h b/Userland/Libraries/LibPthread/pthread.h
index 67e6300911e..5994ae10090 100644
--- a/Userland/Libraries/LibPthread/pthread.h
+++ b/Userland/Libraries/LibPthread/pthread.h
@@ -87,6 +87,10 @@ int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param
         0, 0, CLOCK_MONOTONIC_COARSE \
     }
 
+// FIXME: Actually implement this!
+#define PTHREAD_RWLOCK_INITIALIZER \
+    NULL
+
 #define PTHREAD_KEYS_MAX 64
 #define PTHREAD_DESTRUCTOR_ITERATIONS 4
 
@@ -127,4 +131,18 @@ int pthread_getname_np(pthread_t, char*, size_t);
 
 int pthread_equal(pthread_t t1, pthread_t t2);
 
+int pthread_rwlock_destroy(pthread_rwlock_t*);
+int pthread_rwlock_init(pthread_rwlock_t* __restrict, const pthread_rwlockattr_t* __restrict);
+int pthread_rwlock_rdlock(pthread_rwlock_t*);
+int pthread_rwlock_timedrdlock(pthread_rwlock_t* __restrict, const struct timespec* __restrict);
+int pthread_rwlock_timedwrlock(pthread_rwlock_t* __restrict, const struct timespec* __restrict);
+int pthread_rwlock_tryrdlock(pthread_rwlock_t*);
+int pthread_rwlock_trywrlock(pthread_rwlock_t*);
+int pthread_rwlock_unlock(pthread_rwlock_t*);
+int pthread_rwlock_wrlock(pthread_rwlock_t*);
+int pthread_rwlockattr_destroy(pthread_rwlockattr_t*);
+int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t* __restrict, int* __restrict);
+int pthread_rwlockattr_init(pthread_rwlockattr_t*);
+int pthread_rwlockattr_setpshared(pthread_rwlockattr_t*, int);
+
 __END_DECLS