diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4b3e1c0d2..8b83313cf2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,10 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Removed
 
+- Removed a couple of termios constants on redox that were never actually
+  supported.
+  (#[1483](https://github.com/nix-rust/nix/pull/1483))
+
 ## [0.21.0] - 31 May 2021
 ### Added
 - Added `getresuid` and `getresgid`
diff --git a/Cargo.toml b/Cargo.toml
index df3ca11775..955c09531d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,7 @@ targets = [
 ]
 
 [dependencies]
-libc = { version = "0.2.95", features = [ "extra_traits" ] }
+libc = { version = "0.2.99", features = [ "extra_traits" ] }
 bitflags = ">= 1.1.0, < 1.3.0"
 cfg-if = "1.0"
 
diff --git a/src/sys/termios.rs b/src/sys/termios.rs
index 8c3c1cffc1..fe974dc66c 100644
--- a/src/sys/termios.rs
+++ b/src/sys/termios.rs
@@ -599,7 +599,9 @@ libc_bitflags! {
         ICRNL;
         IXON;
         IXOFF;
+        #[cfg(not(target_os = "redox"))]
         IXANY;
+        #[cfg(not(target_os = "redox"))]
         IMAXBEL;
         #[cfg(any(target_os = "android", target_os = "linux", target_os = "macos"))]
         IUTF8;