diff --git a/src/backend/libc/fs/dir.rs b/src/backend/libc/fs/dir.rs
index cd7f232d3..790f22a2b 100644
--- a/src/backend/libc/fs/dir.rs
+++ b/src/backend/libc/fs/dir.rs
@@ -24,13 +24,7 @@ use crate::fs::{fstat, Stat};
     target_os = "wasi",
 )))]
 use crate::fs::{fstatfs, StatFs};
-#[cfg(not(any(
-    solarish,
-    target_os = "haiku",
-    target_os = "redox",
-    target_os = "vita",
-    target_os = "wasi"
-)))]
+#[cfg(not(any(solarish, target_os = "redox", target_os = "vita", target_os = "wasi")))]
 use crate::fs::{fstatvfs, StatVfs};
 use crate::io;
 #[cfg(not(any(target_os = "fuchsia", target_os = "vita", target_os = "wasi")))]
@@ -243,7 +237,6 @@ impl Dir {
     /// `fstatvfs(self)`
     #[cfg(not(any(
         solarish,
-        target_os = "haiku",
         target_os = "horizon",
         target_os = "redox",
         target_os = "vita",
diff --git a/src/backend/libc/fs/syscalls.rs b/src/backend/libc/fs/syscalls.rs
index ef1033cc3..ab69d4aef 100644
--- a/src/backend/libc/fs/syscalls.rs
+++ b/src/backend/libc/fs/syscalls.rs
@@ -60,7 +60,7 @@ use crate::fs::Timestamps;
 )))]
 use crate::fs::{Dev, FileType};
 use crate::fs::{Mode, OFlags, SeekFrom, Stat};
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 use crate::fs::{StatVfs, StatVfsMountFlags};
 use crate::io;
 #[cfg(all(target_env = "gnu", fix_y2038))]
@@ -271,7 +271,7 @@ pub(crate) fn statfs(filename: &CStr) -> io::Result<StatFs> {
     }
 }
 
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 #[inline]
 pub(crate) fn statvfs(filename: &CStr) -> io::Result<StatVfs> {
     unsafe {
@@ -1591,7 +1591,7 @@ pub(crate) fn fstatfs(fd: BorrowedFd<'_>) -> io::Result<StatFs> {
     }
 }
 
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 pub(crate) fn fstatvfs(fd: BorrowedFd<'_>) -> io::Result<StatVfs> {
     let mut statvfs = MaybeUninit::<c::statvfs>::uninit();
     unsafe {
@@ -1600,7 +1600,7 @@ pub(crate) fn fstatvfs(fd: BorrowedFd<'_>) -> io::Result<StatVfs> {
     }
 }
 
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 fn libc_statvfs_to_statvfs(from: c::statvfs) -> StatVfs {
     StatVfs {
         f_bsize: from.f_bsize as u64,
diff --git a/src/backend/libc/fs/types.rs b/src/backend/libc/fs/types.rs
index 54415bb32..471219e5e 100644
--- a/src/backend/libc/fs/types.rs
+++ b/src/backend/libc/fs/types.rs
@@ -845,7 +845,7 @@ bitflags! {
     }
 }
 
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 bitflags! {
     /// `ST_*` constants for use with [`StatVfs`].
     #[repr(transparent)]
@@ -877,11 +877,11 @@ bitflags! {
         const NOEXEC = c::ST_NOEXEC as u64;
 
         /// `ST_NOSUID`
-        #[cfg(not(any(target_os = "espidf", target_os = "horizon", target_os = "vita")))]
+        #[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "horizon", target_os = "vita")))]
         const NOSUID = c::ST_NOSUID as u64;
 
         /// `ST_RDONLY`
-        #[cfg(not(any(target_os = "espidf", target_os = "horizon", target_os = "vita")))]
+        #[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "horizon", target_os = "vita")))]
         const RDONLY = c::ST_RDONLY as u64;
 
         /// `ST_RELATIME`
@@ -1077,7 +1077,7 @@ pub type Fsid = c::fsid_t;
 ///
 /// [`statvfs`]: crate::fs::statvfs
 /// [`fstatvfs`]: crate::fs::fstatvfs
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 #[allow(missing_docs)]
 pub struct StatVfs {
     pub f_bsize: u64,
diff --git a/src/fs/fd.rs b/src/fs/fd.rs
index 7ce1b3a46..c440f69de 100644
--- a/src/fs/fd.rs
+++ b/src/fs/fd.rs
@@ -40,7 +40,7 @@ use backend::fs::types::Stat;
     target_os = "wasi",
 )))]
 use backend::fs::types::StatFs;
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 use backend::fs::types::StatVfs;
 
 /// Timestamps used by [`utimensat`] and [`futimens`].
@@ -196,7 +196,7 @@ pub fn fstatfs<Fd: AsFd>(fd: Fd) -> io::Result<StatFs> {
 ///
 /// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/fstatvfs.html
 /// [Linux]: https://man7.org/linux/man-pages/man2/fstatvfs.2.html
-#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
 #[inline]
 pub fn fstatvfs<Fd: AsFd>(fd: Fd) -> io::Result<StatVfs> {
     backend::fs::syscalls::fstatvfs(fd.as_fd())
diff --git a/tests/io/ioctl.rs b/tests/io/ioctl.rs
index 721d5e09b..77b0a76f0 100644
--- a/tests/io/ioctl.rs
+++ b/tests/io/ioctl.rs
@@ -1,5 +1,5 @@
 // `ioctl_fionread` on Windows doesn't work on files.
-#[cfg(not(any(windows, target_os = "cygwin")))]
+#[cfg(not(any(windows, target_os = "cygwin", target_os = "haiku")))]
 #[test]
 fn test_ioctls() {
     let file = std::fs::File::open("Cargo.toml").unwrap();