diff --git a/Documentation/x86/boot.rst b/Documentation/x86/boot.rst
index abb9fc164657..fc844913dece 100644
--- a/Documentation/x86/boot.rst
+++ b/Documentation/x86/boot.rst
@@ -851,7 +851,7 @@ Protocol:	2.09+
     struct setup_data {
       __u64 next = 0 or <addr_of_next_setup_data_struct>;
       __u32 type = SETUP_INDIRECT;
-      __u32 len = sizeof(setup_data);
+      __u32 len = sizeof(setup_indirect);
       __u8 data[sizeof(setup_indirect)] = struct setup_indirect {
         __u32 type = SETUP_INDIRECT | SETUP_E820_EXT;
         __u32 reserved = 0;