diff --git a/Kernel/API/POSIX/serenity.h b/Kernel/API/POSIX/serenity.h
new file mode 100644
index 00000000000..eaa30095bcf
--- /dev/null
+++ b/Kernel/API/POSIX/serenity.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <Kernel/API/POSIX/sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define PURGE_ALL_VOLATILE 0x1
+#define PURGE_ALL_CLEAN_INODE 0x2
+
+enum {
+    PERF_EVENT_SAMPLE = 1,
+    PERF_EVENT_MALLOC = 2,
+    PERF_EVENT_FREE = 4,
+    PERF_EVENT_MMAP = 8,
+    PERF_EVENT_MUNMAP = 16,
+    PERF_EVENT_PROCESS_CREATE = 32,
+    PERF_EVENT_PROCESS_EXEC = 64,
+    PERF_EVENT_PROCESS_EXIT = 128,
+    PERF_EVENT_THREAD_CREATE = 256,
+    PERF_EVENT_THREAD_EXIT = 512,
+    PERF_EVENT_CONTEXT_SWITCH = 1024,
+    PERF_EVENT_KMALLOC = 2048,
+    PERF_EVENT_KFREE = 4096,
+    PERF_EVENT_PAGE_FAULT = 8192,
+    PERF_EVENT_SYSCALL = 16384,
+    PERF_EVENT_SIGNPOST = 32768,
+};
+
+#define PERF_EVENT_MASK_ALL (~0ull)
+
+#define THREAD_PRIORITY_MIN 1
+#define THREAD_PRIORITY_LOW 10
+#define THREAD_PRIORITY_NORMAL 30
+#define THREAD_PRIORITY_HIGH 50
+#define THREAD_PRIORITY_MAX 99
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/Kernel/UnixTypes.h b/Kernel/UnixTypes.h
index 22ec9ccbd2c..0bea2516458 100644
--- a/Kernel/UnixTypes.h
+++ b/Kernel/UnixTypes.h
@@ -14,6 +14,7 @@
 #include <Kernel/API/POSIX/net/if_arp.h>
 #include <Kernel/API/POSIX/net/route.h>
 #include <Kernel/API/POSIX/netinet/in.h>
+#include <Kernel/API/POSIX/serenity.h>
 #include <Kernel/API/POSIX/signal.h>
 #include <Kernel/API/POSIX/sys/mman.h>
 #include <Kernel/API/POSIX/sys/socket.h>
@@ -45,25 +46,6 @@ enum {
     _SC_CLK_TCK,
 };
 
-enum {
-    PERF_EVENT_SAMPLE = 1,
-    PERF_EVENT_MALLOC = 2,
-    PERF_EVENT_FREE = 4,
-    PERF_EVENT_MMAP = 8,
-    PERF_EVENT_MUNMAP = 16,
-    PERF_EVENT_PROCESS_CREATE = 32,
-    PERF_EVENT_PROCESS_EXEC = 64,
-    PERF_EVENT_PROCESS_EXIT = 128,
-    PERF_EVENT_THREAD_CREATE = 256,
-    PERF_EVENT_THREAD_EXIT = 512,
-    PERF_EVENT_CONTEXT_SWITCH = 1024,
-    PERF_EVENT_KMALLOC = 2048,
-    PERF_EVENT_KFREE = 4096,
-    PERF_EVENT_PAGE_FAULT = 8192,
-    PERF_EVENT_SYSCALL = 16384,
-    PERF_EVENT_SIGNPOST = 32768,
-};
-
 #define R_OK 4
 #define W_OK 2
 #define X_OK 1
@@ -157,9 +139,6 @@ struct sched_param {
 #define AT_FDCWD -100
 #define AT_SYMLINK_NOFOLLOW 0x100
 
-#define PURGE_ALL_VOLATILE 0x1
-#define PURGE_ALL_CLEAN_INODE 0x2
-
 #define PT_TRACE_ME 1
 #define PT_ATTACH 2
 #define PT_CONTINUE 3
diff --git a/Userland/Libraries/LibC/serenity.h b/Userland/Libraries/LibC/serenity.h
index 7f81f92f040..fd1ef5275e7 100644
--- a/Userland/Libraries/LibC/serenity.h
+++ b/Userland/Libraries/LibC/serenity.h
@@ -7,9 +7,8 @@
 #pragma once
 
 #include <Kernel/API/POSIX/futex.h>
+#include <Kernel/API/POSIX/serenity.h>
 #include <stdio.h>
-#include <sys/cdefs.h>
-#include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 
@@ -24,12 +23,6 @@ int profiling_enable(pid_t, uint64_t);
 int profiling_disable(pid_t);
 int profiling_free_buffer(pid_t);
 
-#define THREAD_PRIORITY_MIN 1
-#define THREAD_PRIORITY_LOW 10
-#define THREAD_PRIORITY_NORMAL 30
-#define THREAD_PRIORITY_HIGH 50
-#define THREAD_PRIORITY_MAX 99
-
 int futex(uint32_t* userspace_address, int futex_op, uint32_t value, const struct timespec* timeout, uint32_t* userspace_address2, uint32_t value3);
 
 static ALWAYS_INLINE int futex_wait(uint32_t* userspace_address, uint32_t value, const struct timespec* abstime, int clockid)
@@ -52,32 +45,8 @@ static ALWAYS_INLINE int futex_wake(uint32_t* userspace_address, uint32_t count)
     return futex(userspace_address, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, count, NULL, NULL, 0);
 }
 
-#define PURGE_ALL_VOLATILE 0x1
-#define PURGE_ALL_CLEAN_INODE 0x2
-
 int purge(int mode);
 
-enum {
-    PERF_EVENT_SAMPLE = 1,
-    PERF_EVENT_MALLOC = 2,
-    PERF_EVENT_FREE = 4,
-    PERF_EVENT_MMAP = 8,
-    PERF_EVENT_MUNMAP = 16,
-    PERF_EVENT_PROCESS_CREATE = 32,
-    PERF_EVENT_PROCESS_EXEC = 64,
-    PERF_EVENT_PROCESS_EXIT = 128,
-    PERF_EVENT_THREAD_CREATE = 256,
-    PERF_EVENT_THREAD_EXIT = 512,
-    PERF_EVENT_CONTEXT_SWITCH = 1024,
-    PERF_EVENT_KMALLOC = 2048,
-    PERF_EVENT_KFREE = 4096,
-    PERF_EVENT_PAGE_FAULT = 8192,
-    PERF_EVENT_SYSCALL = 16384,
-    PERF_EVENT_SIGNPOST = 32768,
-};
-
-#define PERF_EVENT_MASK_ALL (~0ull)
-
 int perf_event(int type, uintptr_t arg1, uintptr_t arg2);
 int perf_register_string(char const* string, size_t string_length);