diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm.cpp b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm.cpp
index 8a2d7abfb277f..1477cf75e9f6f 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm.cpp
@@ -15,7 +15,6 @@
 #include "llvm/Support/Endian.h"
 
 #if defined(__FreeBSD__) && defined(__arm__)
-#include <cstddef>
 #include <machine/frame.h>
 #endif
 
diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm64.cpp b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm64.cpp
index c4b3e2b0c25fc..80a5e0cf13a7c 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm64.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_arm64.cpp
@@ -19,7 +19,6 @@
 #include "llvm/Support/Endian.h"
 
 #if defined(__FreeBSD__) && defined(__aarch64__)
-#include <cstddef>
 #include <machine/pcb.h>
 #include <sys/param.h>
 #endif
diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_i386.cpp b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_i386.cpp
index c88f7f601b12a..0b44e52764d7c 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_i386.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_i386.cpp
@@ -14,7 +14,6 @@
 #include "llvm/Support/Endian.h"
 
 #if defined(__FreeBSD__) && defined(__i386__)
-#include <cstddef>
 #include <machine/pcb.h>
 #endif
 
diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_ppc64le.cpp b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_ppc64le.cpp
index b8e5578b1b51e..3b0f269a3014d 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_ppc64le.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_ppc64le.cpp
@@ -14,7 +14,6 @@
 #include "llvm/Support/Endian.h"
 
 #if defined(__FreeBSD__) && defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)
-#include <cstddef>
 #include <machine/pcb.h>
 #endif
 
diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_riscv64.cpp b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_riscv64.cpp
index ea632968f9ebc..52a2f91742c76 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_riscv64.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_riscv64.cpp
@@ -14,7 +14,6 @@
 #include "llvm/Support/Endian.h"
 
 #if defined(__FreeBSD__) && defined(__riscv) && __riscv_xlen == 64
-#include <cstddef>
 #include <machine/pcb.h>
 #endif
 
diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_x86_64.cpp b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_x86_64.cpp
index 0034408b8f9ba..8f833aa47e486 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_x86_64.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/RegisterContextFreeBSDKernelCore_x86_64.cpp
@@ -14,7 +14,6 @@
 #include "llvm/Support/Endian.h"
 
 #if defined(__FreeBSD__) && defined(__amd64__)
-#include <cstddef>
 #include <machine/pcb.h>
 #endif