diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 69cc6c68741e..c36e6156b6a3 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -624,12 +624,12 @@ SYM_FUNC_END(.Lno_longmode)
 
 	.data
 SYM_DATA_START_LOCAL(gdt64)
-	.word	gdt_end - gdt
+	.word	gdt_end - gdt - 1
 	.quad   0
 SYM_DATA_END(gdt64)
 	.balign	8
 SYM_DATA_START_LOCAL(gdt)
-	.word	gdt_end - gdt
+	.word	gdt_end - gdt - 1
 	.long	gdt
 	.word	0
 	.quad	0x00cf9a000000ffff	/* __KERNEL32_CS */