diff --git a/extra/unix/types/macosx/macosx.factor b/extra/unix/types/macosx/macosx.factor
index 822e32251a..8f9c5082df 100644
--- a/extra/unix/types/macosx/macosx.factor
+++ b/extra/unix/types/macosx/macosx.factor
@@ -1,4 +1,6 @@
 
+USING: alien.syntax ;
+
 IN: unix.types
 
 ! Darwin 9.1.0 ppc