diff --git a/redox-rt/src/sys.rs b/redox-rt/src/sys.rs
index f0363a39a9..1cf58baec4 100644
--- a/redox-rt/src/sys.rs
+++ b/redox-rt/src/sys.rs
@@ -561,3 +561,8 @@ pub fn std_fs_call_rw(fd: usize, payload: &mut [u8], metadata: &StdFsCallMeta) -
 pub fn fstat(fd: usize, stat: &mut syscall::Stat) -> Result<usize> {
     std_fs_call_ro(fd, stat, &StdFsCallMeta::new(StdFsCallKind::Fstat, 0, 0))
 }
+
+pub fn fcntl(fd: usize, cmd: usize, arg: usize) -> Result<usize> {
+    let _siglock = tmp_disable_signals();
+    FdGuard::new(syscall::fcntl(fd, cmd, arg)).map(|g| g.as_raw_fd())
+}
diff --git a/src/platform/redox/libredox.rs b/src/platform/redox/libredox.rs
index 2aad40861f..04c76dede8 100644
--- a/src/platform/redox/libredox.rs
+++ b/src/platform/redox/libredox.rs
@@ -378,6 +378,11 @@ pub unsafe extern "C" fn redox_close_v1(fd: usize) -> RawResult {
     Error::mux(syscall::close(fd))
 }
 
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn redox_fcntl_v0(fd: usize, cmd: usize, arg: usize) -> RawResult {
+    Error::mux(redox_rt::sys::fcntl(fd, cmd, arg))
+}
+
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn redox_get_pid_v1() -> RawResult {
     redox_rt::sys::posix_getpid() as _