--- a/src/JavaZipSupport.st	Sun Jul 22 18:32:40 2012 +0000
+++ b/src/JavaZipSupport.st	Mon Jul 23 09:43:13 2012 +0000
@@ -201,7 +201,7 @@
     strm->avail_out = __intVal(out_len);
 
     if (__intVal(setParams)) {
-        code = deflateParams(strm, level, strategy);
+        code = deflateParams(strm, __intVal(level), __intVal(strategy));
         switch (code) {
             case Z_OK:
                 setParams = __intVal(0);