diff --git a/src/arch/amd64/gdt.S b/src/arch/amd64/gdt.S
index b47a9f0..d761035 100644
--- a/src/arch/amd64/gdt.S
+++ b/src/arch/amd64/gdt.S
@@ -26,11 +26,11 @@ __arch_setgdt:
 	/* load the GDT */
 	lgdt	(%rcx)
 
+	/* apply the GDT */
 	push	$0x8
 	lea	gdt_flush, %rax
 	push	%rax
 	retf
-
 gdt_flush:
 	mov	$0x10, %ax
 	mov	%ax, %ds
diff --git a/src/arch/amd64/gdt.h b/src/arch/amd64/gdt.h
index 7f176f7..b37efa7 100644
--- a/src/arch/amd64/gdt.h
+++ b/src/arch/amd64/gdt.h
@@ -9,9 +9,4 @@
 
 # include "../i386/gdt.h"
 
-
-/* public */
-/* prototypes */
-int _arch_setgdt64(GDT const * gdt, size_t count);
-
-#endif /* !UKERNEL_ARCH_I386_GDT_H */
+#endif /* !UKERNEL_ARCH_AMD64_GDT_H */
diff --git a/src/arch/i386/gdt.S b/src/arch/i386/gdt.S
index 18785f4..93574cf 100644
--- a/src/arch/i386/gdt.S
+++ b/src/arch/i386/gdt.S
@@ -24,6 +24,7 @@ __arch_setgdt:
 	shl	$0x3, %eax
 	dec	%eax
 	mov	%ax, (%ecx)
+
 	/* load the GDT */
 	lgdt	(gdt_descriptor)
 
@@ -34,7 +35,7 @@ __arch_setgdt:
 	mov	%ax, %fs
 	mov	%ax, %gs
 	mov	%ax, %ss
-	ljmp	$0x08, $gdt_flush
+	ljmp	$0x8, $gdt_flush
 gdt_flush:
 
 	ret