diff --git a/src/kernel/boot/multiboot_header.S b/src/kernel/boot/multiboot_header.S
index 527b894..ab80287 100644
--- a/src/kernel/boot/multiboot_header.S
+++ b/src/kernel/boot/multiboot_header.S
@@ -1,14 +1,8 @@
 #include <multiboot.h>
 .section .multiboot
 
-.align 0x4
-MultibootHeader1:
-.long MBOOT1_MAGIC
-.long MBOOT1_FLAGS
-.long MBOOT1_CS
-
 .align 0x8
-MultibootHeader2:
+Multiboot2Header:
 .long MBOOT2_MAGIC
 .long MBOOT2_ARCH
 .long MBOOT2_LENGTH
@@ -17,4 +11,4 @@ MultibootHeader2:
 .short 0
 .short 0
 .long 8
-MultibootHeader2End:
+Multiboot2HeaderEnd:
diff --git a/src/kernel/include/multiboot.h b/src/kernel/include/multiboot.h
index 35fe12c..9964bd1 100644
--- a/src/kernel/include/multiboot.h
+++ b/src/kernel/include/multiboot.h
@@ -1,12 +1,7 @@
 #pragma once
 
-#define MBOOT1_MAGIC 0x1BADB002
-#define MBOOT1_REPLY 0x2BADB002
-#define MBOOT1_FLAGS 0
-#define MBOOT1_CS -(MBOOT1_FLAGS + MBOOT1_MAGIC)
-
 #define MBOOT2_MAGIC 0xE85250D6
 #define MBOOT2_REPLY 0x36D76289
 #define MBOOT2_ARCH 0
-#define MBOOT2_LENGTH (MultibootHeader2End - MultibootHeader2)
+#define MBOOT2_LENGTH (Multiboot2HeaderEnd - Multiboot2Header)
 #define MBOOT2_CHECKSUM -(MBOOT2_MAGIC + MBOOT2_ARCH + MBOOT2_LENGTH)
diff --git a/toolchain/mkiso b/toolchain/mkiso
index b5c232d..11d8a97 100755
--- a/toolchain/mkiso
+++ b/toolchain/mkiso
@@ -15,9 +15,6 @@ set default=0
 menuentry "mittos64" {
   multiboot2 /kernel
 }
-menuentry "mittos64 multiboot1" {
-  multiboot /kernel
-}
 
 EOF