diff --git a/basis/compiler/cfg/builder/alien/alien.factor b/basis/compiler/cfg/builder/alien/alien.factor
index d3bcbd3..6c7a20e 100644
--- a/basis/compiler/cfg/builder/alien/alien.factor
+++ b/basis/compiler/cfg/builder/alien/alien.factor
@@ -72,7 +72,7 @@ M:: struct-c-type unbox-parameter ( src c-type -- )
         [ [ alloc-stack-param ] keep \ ##store-stack-param new-insn ]
         [ [ next-reg-param ] keep \ ##store-reg-param new-insn ]
         if
-    ] map [ ##store-stack-param? ] partition [ % ] bi@ ;
+    ] map reverse % ;
 
 : objects>registers ( params -- stack-size )
     [ abi>> ] [ parameters>> ] [ return>> ] tri