Index: kernel/arch/amd64/include/arch/boot/memmap_struct.h
===================================================================
--- kernel/arch/amd64/include/arch/boot/memmap_struct.h	(revision 30e9f42a78ab720d6d4fc7f8484c61c6b7964bdd)
+++ kernel/arch/amd64/include/arch/boot/memmap_struct.h	(revision d9fdd5aada2408706403a3f04ab550635bfc5907)
@@ -26,5 +26,6 @@
  */
 
-#pragma once
+#ifndef KERN_ARCH_BOOT_MEMMAP_STRUCT_H_
+#define KERN_ARCH_BOOT_MEMMAP_STRUCT_H_
 
 #define E820MEMMAP_OFFSET_BASE_ADDRESS  0x00
@@ -44,3 +45,4 @@
 
 #endif
+#endif
 
Index: kernel/arch/amd64/include/arch/context_struct.h
===================================================================
--- kernel/arch/amd64/include/arch/context_struct.h	(revision 30e9f42a78ab720d6d4fc7f8484c61c6b7964bdd)
+++ kernel/arch/amd64/include/arch/context_struct.h	(revision d9fdd5aada2408706403a3f04ab550635bfc5907)
@@ -26,5 +26,6 @@
  */
 
-#pragma once
+#ifndef KERN_ARCH_CONTEXT_STRUCT_H_
+#define KERN_ARCH_CONTEXT_STRUCT_H_
 
 #define CONTEXT_OFFSET_SP   0x00
@@ -61,3 +62,4 @@
 
 #endif
+#endif
 
Index: kernel/arch/amd64/include/arch/istate_struct.h
===================================================================
--- kernel/arch/amd64/include/arch/istate_struct.h	(revision 30e9f42a78ab720d6d4fc7f8484c61c6b7964bdd)
+++ kernel/arch/amd64/include/arch/istate_struct.h	(revision d9fdd5aada2408706403a3f04ab550635bfc5907)
@@ -26,5 +26,6 @@
  */
 
-#pragma once
+#ifndef KERN_ARCH_ISTATE_STRUCT_H_
+#define KERN_ARCH_ISTATE_STRUCT_H_
 
 #define ISTATE_OFFSET_RAX         0x00
@@ -92,3 +93,4 @@
 
 #endif
+#endif
 
Index: kernel/arch/amd64/include/arch/kseg_struct.h
===================================================================
--- kernel/arch/amd64/include/arch/kseg_struct.h	(revision 30e9f42a78ab720d6d4fc7f8484c61c6b7964bdd)
+++ kernel/arch/amd64/include/arch/kseg_struct.h	(revision d9fdd5aada2408706403a3f04ab550635bfc5907)
@@ -26,5 +26,6 @@
  */
 
-#pragma once
+#ifndef KERN_ARCH_KSEG_STRUCT_H_
+#define KERN_ARCH_KSEG_STRUCT_H_
 
 #define KSEG_OFFSET_USTACK_RSP  0x00
@@ -44,3 +45,4 @@
 
 #endif
+#endif