diff --git a/src/unix.rs b/src/unix.rs
index 10d2f05..77898b4 100644
--- a/src/unix.rs
+++ b/src/unix.rs
@@ -77,6 +77,7 @@ extern "C" {
             target_os = "netbsd",
             target_os = "android",
             target_os = "espidf",
+            target_os = "nuttx",
             target_os = "vxworks",
             target_os = "cygwin",
             target_env = "newlib"