Hi, CFFI developers There's another change from LispWorks 5.1's static array allocation: Instead of (sys:in-static-area (make-array 3 :element-type '(unsigned-byte 8) :initial-contents '(65 77 23))) We use this now: (make-array 3 :element-type '(unsigned-byte 8) :initial-contents '(65 77 23) :allocation :static) see http://www.lispworks.com/documentation/lw51/FLI/html/fli-130.htm#pgfId-11128... I hope the patch in attach can be merged. Thanks.