diff --git a/CHANGELOG.md b/CHANGELOG.md
index f65ebda..e6d56d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.4.2] - 2024-04-22
+
+### Changed
+
+- `FD_CLOEXEC` bit mask definition fixed. The wrong definition effectively lead to `close-on-exec` flag not being set for all `listen_fds`.
+
 ## [0.4.1] - 2022-08-31
 
 ### Changed
diff --git a/src/ffi.rs b/src/ffi.rs
index 5101004..4c111a7 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -5,6 +5,6 @@ extern "C" {
 pub const F_GETFD: i32 = 1;
 pub const F_SETFD: i32 = 2;
 
-pub const FD_CLOEXEC: i32 = 2;
+pub const FD_CLOEXEC: i32 = 1;
 
 pub const EBADF: i32 = 9;