diff --git a/rtl/unix/sockets.pp b/rtl/unix/sockets.pp
index 769b1f3398..48337b5a5a 100644
--- a/rtl/unix/sockets.pp
+++ b/rtl/unix/sockets.pp
@@ -19,11 +19,11 @@ Uses baseunix,UnixType;
 
 {$i osdefs.inc}       { Compile time defines }
 
-{$ifdef FreeBSD}
-{$DEFINE SOCK_HAS_SINLEN}               // BSD definition of socketaddr
-{$endif}
-
-{$ifdef Darwin}
+{$if 
+     defined(FreeBSD) or 
+     defined(Darwin) or 
+     defined(Haiku)
+}
 {$DEFINE SOCK_HAS_SINLEN}               // BSD definition of socketaddr
 {$endif}