diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca8040f..3b22de3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@
 - Add VxWorks support
   [#105](https://github.com/lambda-fairy/rust-errno/pull/105)
 
+- Add cygwin support
+  [#106](https://github.com/lambda-fairy/rust-errno/pull/106)
+
 # [0.3.10] - 2024-11-29
 
 - Update to windows-sys 0.59
diff --git a/Cargo.toml b/Cargo.toml
index bb9aed3..6bae929 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,3 +31,9 @@ libc = { version = "0.2", default-features = false }
 [features]
 default = ["std"]
 std = ["libc/std"]
+
+# TODO: Remove this exemption when Cygwin support lands in Rust stable
+# https://github.com/rust-lang/rust/pull/134999
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = ['cfg(target_os, values("cygwin"))']
diff --git a/src/unix.rs b/src/unix.rs
index 726748b..5536eef 100644
--- a/src/unix.rs
+++ b/src/unix.rs
@@ -78,6 +78,7 @@ extern "C" {
             target_os = "android",
             target_os = "espidf",
             target_os = "vxworks",
+            target_os = "cygwin",
             target_env = "newlib"
         ),
         link_name = "__errno"