diff --git a/native/jni/magiskboot/format.h b/native/jni/magiskboot/format.h
index cacab29a3..eac6fe4ca 100644
--- a/native/jni/magiskboot/format.h
+++ b/native/jni/magiskboot/format.h
@@ -39,7 +39,7 @@ typedef enum {
 #define SEANDROID_MAGIC "SEANDROIDENFORCE"
 #define TEGRABLOB_MAGIC "-SIGNED-BY-SIGNBLOB-"
 #define NOOK_MAGIC      "Green Loader"
-#define NOOK_PRE_HEADER_SZ 1048575
+#define NOOK_PRE_HEADER_SZ 1048576
 
 #define SUP_LIST      ((char *[]) { "gzip", "xz", "lzma", "bzip2", "lz4", "lz4_legacy", NULL })
 #define SUP_EXT_LIST  ((char *[]) { "gz", "xz", "lzma", "bz2", "lz4", "lz4", NULL })