diff --git a/lib/corereqs.js b/lib/corereqs.js
index 8fa1d76..98a959d 100644
--- a/lib/corereqs.js
+++ b/lib/corereqs.js
@@ -217,25 +217,26 @@ function packValueMask(reqname, values)
     {
         var v = reqValueMask[value];
         if (v) {
-          var valueBit = v.mask;
-          if (!valueBit)
-              throw new Error(reqname + ': incorrect value param ' + value);
-          masksList.push(valueBit);
-          bitmask |= valueBit;
+            var valueBit = v.mask;
+            if (!valueBit)
+                throw new Error(reqname + ': incorrect value param ' + value);
+            masksList.push(valueBit);
+            bitmask |= valueBit;
         }
     }
 
     /* numeric sort */
     masksList.sort(function(a, b) {
-      return a - b;
+        return a - b;
     });
 
     var args = [];
-    for (m in masksList)
+    for (var i=0,length=masksList.length;i<length;i++)
     {
-       var valueName = reqValueMaskName[masksList[m]];
-       format += reqValueMask[valueName].format
-       args.push( values[valueName] );
+        var value = masksList[i];
+        var valueName = reqValueMaskName[value];
+        format += reqValueMask[valueName].format
+        args.push( values[valueName] );
     }
     return [format, bitmask, args]
 }