diff --git a/js/kiri-driver-cam.js b/js/kiri-driver-cam.js
index 1db0cf2b..c9e0117c 100644
--- a/js/kiri-driver-cam.js
+++ b/js/kiri-driver-cam.js
@@ -1095,7 +1095,7 @@ var gs_kiri_cam = exports;
                 }
             });
 
-            // facing (once used fill, now part of roughing)
+            // facing (previously separate. now part of roughing)
             layer = slice.layers.fill;
             slice.tops.forEach(function(top) {
                 if (top.fill_lines) {
diff --git a/js/kiri.js b/js/kiri.js
index 759b643c..10fd4827 100644
--- a/js/kiri.js
+++ b/js/kiri.js
@@ -1210,7 +1210,7 @@ self.kiri.copyright = exports.COPYRIGHT;
     function platformUpdateStock(refresh) {
         let sd = settings.process;
         let offset = UI.camStockOffset.checked;
-        let stockSet = sd.camStockX && sd.camStockY && sd.camStockZ >= 0;
+        let stockSet = offset || (sd.camStockX && sd.camStockY && sd.camStockZ > 0);
         let scale = unitScale();
         settings.stock = { };
         camTopZ = topZ;