diff --git a/Kernel/API/POSIX/select.h b/Kernel/API/POSIX/select.h
new file mode 100644
index 0000000000..fc80e62a76
--- /dev/null
+++ b/Kernel/API/POSIX/select.h
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#define FD_SETSIZE 1024
diff --git a/Kernel/Process.h b/Kernel/Process.h
index 7950df8b9c..e7cbc3c54b 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -14,6 +14,7 @@
 #include <AK/RefPtr.h>
 #include <AK/Userspace.h>
 #include <AK/Variant.h>
+#include <Kernel/API/POSIX/select.h>
 #include <Kernel/API/POSIX/sys/resource.h>
 #include <Kernel/API/Syscall.h>
 #include <Kernel/Assertions.h>
diff --git a/Kernel/Syscalls/poll.cpp b/Kernel/Syscalls/poll.cpp
index fd9bfbe7a6..7302fa8566 100644
--- a/Kernel/Syscalls/poll.cpp
+++ b/Kernel/Syscalls/poll.cpp
@@ -6,6 +6,7 @@
 
 #include <AK/ScopeGuard.h>
 #include <AK/Time.h>
+#include <Kernel/API/POSIX/select.h>
 #include <Kernel/Debug.h>
 #include <Kernel/FileSystem/OpenFileDescription.h>
 #include <Kernel/Process.h>
diff --git a/Kernel/Thread.h b/Kernel/Thread.h
index 7e7e8559e3..a858664c6c 100644
--- a/Kernel/Thread.h
+++ b/Kernel/Thread.h
@@ -16,6 +16,7 @@
 #include <AK/Variant.h>
 #include <AK/Vector.h>
 #include <Kernel/API/POSIX/sched.h>
+#include <Kernel/API/POSIX/select.h>
 #include <Kernel/API/POSIX/signal_numbers.h>
 #include <Kernel/Arch/RegisterState.h>
 #include <Kernel/Arch/ThreadRegisters.h>
@@ -31,7 +32,6 @@
 #include <Kernel/Locking/SpinlockProtected.h>
 #include <Kernel/Memory/VirtualRange.h>
 #include <Kernel/UnixTypes.h>
-#include <LibC/fd_set.h>
 
 namespace Kernel {
 
diff --git a/Userland/Libraries/LibC/fd_set.h b/Userland/Libraries/LibC/fd_set.h
index 74079d9304..3aae3225c0 100644
--- a/Userland/Libraries/LibC/fd_set.h
+++ b/Userland/Libraries/LibC/fd_set.h
@@ -6,7 +6,8 @@
 
 #pragma once
 
-#define FD_SETSIZE 1024
+#include <Kernel/API/POSIX/select.h>
+
 #define FD_ZERO(set)                      \
     do {                                  \
         memset((set), 0, sizeof(fd_set)); \