diff --git a/fcl/Makefile.fpc b/fcl/Makefile.fpc
index 985f5caf1c..224cd75bc4 100644
--- a/fcl/Makefile.fpc
+++ b/fcl/Makefile.fpc
@@ -44,6 +44,7 @@ includedir_netbsd=unix
 includedir_openbsd=unix
 includedir_sunos=posix
 includedir_qnx=posix
+includedir_beos=posix
 includedir_emx=os2
 sourcedir=$(OS_TARGET) inc