diff --git a/basis/cpu/x86/64/unix/unix.factor b/basis/cpu/x86/64/unix/unix.factor
index 1a65132fab..ddb412873a 100644
--- a/basis/cpu/x86/64/unix/unix.factor
+++ b/basis/cpu/x86/64/unix/unix.factor
@@ -1,7 +1,9 @@
 ! Copyright (C) 2008 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: kernel layouts system compiler.cfg.registers
-cpu.architecture cpu.x86.assembler cpu.x86 ;
+USING: accessors arrays sequences math splitting make assocs
+kernel layouts system alien.c-types alien.structs
+cpu.architecture cpu.x86.assembler cpu.x86
+compiler.codegen compiler.cfg.registers ;
 IN: cpu.x86.64.unix
 
 M: int-regs param-regs drop { RDI RSI RDX RCX R8 R9 } ;