diff --git a/public/modules/ice.js b/public/modules/ice.js
index d1127825..8dbbeeb3 100644
--- a/public/modules/ice.js
+++ b/public/modules/ice.js
@@ -12,6 +12,7 @@ window.Ice = (function () {
 
   // Generate glaciers and icebergs based on temperature and height
   function generate() {
+    clear();
     const {cells, features} = grid;
     const {temp, h} = cells;
     Math.random = aleaPRNG(seed);
@@ -31,8 +32,7 @@ window.Ice = (function () {
         isolines[type].polygons.forEach(points => {
           const clipped = clipPoly(points);
           pack.ice.glaciers.push({
-            points: clipped,
-            offset: null
+            points: clipped
           });
         });
       }
diff --git a/public/modules/ui/heightmap-editor.js b/public/modules/ui/heightmap-editor.js
index 3c3d0a6e..6fe69b78 100644
--- a/public/modules/ui/heightmap-editor.js
+++ b/public/modules/ui/heightmap-editor.js
@@ -468,7 +468,6 @@ function editHeightmap(options) {
     });
 
     // recalculate ice
-    Ice.clear();
     Ice.generate();
     drawIce();