diff --git a/lib/posix/posix.nim b/lib/posix/posix.nim
index 12fc8fd571..fbe945df33 100644
--- a/lib/posix/posix.nim
+++ b/lib/posix/posix.nim
@@ -958,7 +958,7 @@ proc `==`*(x, y: SocketHandle): bool {.borrow.}
 proc accept*(a1: SocketHandle, a2: ptr SockAddr, a3: ptr SockLen): SocketHandle {.
   importc, header: "<sys/socket.h>", sideEffect.}
 
-when defined(linux) or defined(bsd):
+when defined(linux) or defined(bsd) or defined(nuttx):
   proc accept4*(a1: SocketHandle, a2: ptr SockAddr, a3: ptr SockLen,
                 flags: cint): SocketHandle {.importc, header: "<sys/socket.h>".}
 
diff --git a/lib/posix/posix_other.nim b/lib/posix/posix_other.nim
index 1b6734b518..d5e3c782e5 100644
--- a/lib/posix/posix_other.nim
+++ b/lib/posix/posix_other.nim
@@ -646,7 +646,7 @@ elif defined(nuttx):
 else:
   var SO_REUSEPORT* {.importc, header: "<sys/socket.h>".}: cint
 
-when defined(linux) or defined(bsd):
+when defined(linux) or defined(bsd) or defined(nuttx):
   var SOCK_CLOEXEC* {.importc, header: "<sys/socket.h>".}: cint
 
 when defined(macosx):