diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e8803febb..8f3c9a2a38 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,11 @@ This project adheres to [Semantic Versioning](https://semver.org/).
   (#[1464](https://github.com/nix-rust/nix/pull/1464))
 
 ### Fixed
+
+- Added more errno definitions for better backwards compatibility with
+  Nix 0.21.0.
+  (#[1467](https://github.com/nix-rust/nix/pull/1467))
+
 ### Removed
 
 ## [0.22.0] - 9 July 2021
diff --git a/src/errno.rs b/src/errno.rs
index 00e20140b2..9c2dfe463e 100644
--- a/src/errno.rs
+++ b/src/errno.rs
@@ -905,6 +905,22 @@ mod consts {
         EHWPOISON       = libc::EHWPOISON,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EDEADLOCK instead"
+    )]
+    pub const EDEADLOCK:   Errno = Errno::EDEADLK;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::ENOTSUP instead"
+    )]
+    pub const ENOTSUP:  Errno = Errno::EOPNOTSUPP;
+
     impl Errno {
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
         pub const EDEADLOCK:   Errno = Errno::EDEADLK;
@@ -1167,6 +1183,22 @@ mod consts {
         EQFULL          = libc::EQFULL,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::ELAST instead"
+    )]
+    pub const ELAST:  Errno = Errno::EQFULL;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EDEADLOCK instead"
+    )]
+    pub const EDEADLOCK:   Errno = Errno::EDEADLK;
+
     impl Errno {
         pub const ELAST: Errno       = Errno::EQFULL;
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
@@ -1392,6 +1424,27 @@ mod consts {
         EOWNERDEAD      = libc::EOWNERDEAD,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::ELAST instead"
+    )]
+    pub const ELAST: Errno       = Errno::EOWNERDEAD;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EDEADLOCK instead"
+    )]
+    pub const EDEADLOCK:   Errno = Errno::EDEADLK;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EOPNOTSUPP instead"
+    )]
+    pub const EOPNOTSUPP:  Errno = Errno::ENOTSUP;
+
     impl Errno {
         pub const ELAST: Errno       = Errno::EOWNERDEAD;
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
@@ -1607,6 +1660,27 @@ mod consts {
         EASYNC          = libc::EASYNC,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::ELAST instead"
+    )]
+    pub const ELAST: Errno       = Errno::EASYNC;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EDEADLOCK instead"
+    )]
+    pub const EDEADLOCK:   Errno = Errno::EDEADLK;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EOPNOTSUPP instead"
+    )]
+    pub const EOPNOTSUPP:  Errno = Errno::ENOTSUP;
+
     impl Errno {
         pub const ELAST: Errno       = Errno::EASYNC;
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
@@ -1821,6 +1895,17 @@ mod consts {
         EPROTO          = libc::EPROTO,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::ELAST instead"
+    )]
+    pub const ELAST: Errno       = Errno::ENOTSUP;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+
     impl Errno {
         pub const ELAST: Errno       = Errno::ENOTSUP;
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
@@ -2034,6 +2119,17 @@ mod consts {
         EPROTO          = libc::EPROTO,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::ELAST instead"
+    )]
+    pub const ELAST: Errno       = Errno::ENOTSUP;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+
     impl Errno {
         pub const ELAST: Errno       = Errno::ENOTSUP;
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
@@ -2237,6 +2333,12 @@ mod consts {
         EPROTO = libc::EPROTO,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+
     impl Errno {
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
     }
@@ -2464,6 +2566,17 @@ mod consts {
         ESTALE = libc::ESTALE,
     }
 
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::ELAST instead"
+    )]
+    pub const ELAST: Errno = Errno::ELAST;
+    #[deprecated(
+        since = "0.22.1",
+        note = "use nix::errno::Errno::EWOULDBLOCK instead"
+    )]
+    pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
+
     impl Errno {
         pub const ELAST: Errno       = Errno::ESTALE;
         pub const EWOULDBLOCK: Errno = Errno::EAGAIN;