diff --git a/Kernel/CMakeLists.txt b/Kernel/CMakeLists.txt
index b750ed7e2b..219f7f025a 100644
--- a/Kernel/CMakeLists.txt
+++ b/Kernel/CMakeLists.txt
@@ -292,6 +292,7 @@ set(KERNEL_SOURCES
     Syscalls/lseek.cpp
     Syscalls/mkdir.cpp
     Syscalls/mknod.cpp
+    Syscalls/mmap.cpp
     Syscalls/mount.cpp
     Syscalls/open.cpp
     Syscalls/perf_event.cpp
@@ -401,7 +402,6 @@ if ("${SERENITY_ARCH}" STREQUAL "x86_64")
         Syscall.cpp
         Syscalls/execve.cpp
         Syscalls/fork.cpp
-        Syscalls/mmap.cpp
         Syscalls/sigaction.cpp
     )
 
diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp
index d71a170301..4931624089 100644
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@@ -6,10 +6,10 @@
  */
 
 #include <Kernel/API/VirtualMemoryAnnotations.h>
+#include <Kernel/Arch/CPU.h>
 #include <Kernel/Arch/PageDirectory.h>
 #include <Kernel/Arch/SafeMem.h>
 #include <Kernel/Arch/SmapDisabler.h>
-#include <Kernel/Arch/x86_64/MSR.h>
 #include <Kernel/FileSystem/Custody.h>
 #include <Kernel/FileSystem/OpenFileDescription.h>
 #include <Kernel/Memory/AnonymousVMObject.h>
@@ -22,6 +22,10 @@
 #include <Kernel/Process.h>
 #include <LibELF/Validation.h>
 
+#if ARCH(X86_64)
+#    include <Kernel/Arch/x86_64/MSR.h>
+#endif
+
 namespace Kernel {
 
 static bool should_make_executable_exception_for_dynamic_loader(bool make_readable, bool make_writable, bool make_executable, Memory::Region const& region)
@@ -562,8 +566,10 @@ ErrorOr<FlatPtr> Process::sys$allocate_tls(Userspace<char const*> initial_data,
 
         TRY(main_thread->make_thread_specific_region({}));
 
+#if ARCH(X86_64)
         MSR fs_base_msr(MSR_FS_BASE);
         fs_base_msr.set(main_thread->thread_specific_data().get());
+#endif
 
         return m_master_tls_region.unsafe_ptr()->vaddr().get();
     });