1diff --git a/Package.swift b/Package.swift
2index 39c6fb4b2f..02c08b898d 100644
3--- a/Package.swift
4+++ b/Package.swift
5@@ -26,7 +26,7 @@
6 .target(name: "NIOFoundationCompat", dependencies: ["NIO"]),
7 .target(name: "CNIOAtomics", dependencies: []),
8 .target(name: "CNIOSHA1", dependencies: []),
9- .target(name: "CNIOLinux", dependencies: []),
10+ .target(name: "CNIOLinux", dependencies: [], cSettings: [.define("_GNU_SOURCE")]),
11 .target(name: "CNIODarwin", dependencies: [], cSettings: [.define("__APPLE_USE_RFC_3542")]),
12 .target(name: "CNIOWindows", dependencies: []),
13 .target(name: "NIOConcurrencyHelpers",