diff --git a/vmm/src/userfaultfd.rs b/vmm/src/userfaultfd.rs
index 3f8447a32..f79ef5232 100644
--- a/vmm/src/userfaultfd.rs
+++ b/vmm/src/userfaultfd.rs
@@ -6,7 +6,7 @@
 pub const UFFDIO_API: u64 = 0xc018_aa3f; // _IOWR(0xAA, 0x3F, struct uffdio_api)
 pub const UFFDIO_REGISTER: u64 = 0xc020_aa00; // _IOWR(0xAA, 0x00, struct uffdio_register)
 pub const UFFDIO_COPY: u64 = 0xc028_aa03; // _IOWR(0xAA, 0x03, struct uffdio_copy)
-pub const UFFDIO_WAKE: u64 = 0x4010_aa02; // _IOW(0xAA, 0x02, struct uffdio_range)
+pub const UFFDIO_WAKE: u64 = 0x8010_aa02; // _IOR(0xAA, 0x02, struct uffdio_range)
 
 // Seccomp compares these as Dword (u32); ensure they fit.
 const _: () = assert!(UFFDIO_API <= u32::MAX as u64);
@@ -17,8 +17,8 @@ const _: () = assert!(UFFDIO_WAKE <= u32::MAX as u64);
 pub const UFFD_API: u64 = 0xAA;
 pub const UFFDIO_REGISTER_MODE_MISSING: u64 = 1;
 pub const UFFD_EVENT_PAGEFAULT: u8 = 0x12;
+pub const UFFD_FEATURE_MISSING_HUGETLBFS: u64 = 1 << 4;
 pub const UFFD_FEATURE_MISSING_SHMEM: u64 = 1 << 5;
-pub const UFFD_FEATURE_MISSING_HUGETLBFS: u64 = 1 << 6;
 
 const _UFFDIO_COPY: u64 = 0x03;
 const _UFFDIO_WAKE: u64 = 0x02;