diff --git a/compacting-storage.lua b/compacting-storage.lua
index 019ed84..93de513 100644
--- a/compacting-storage.lua
+++ b/compacting-storage.lua
@@ -122,7 +122,7 @@ function dist_to_num (dist)
 end
 
 function get_dist (item_type, items)
-    local dist = { nuggets: 0, ingots: 0, blocks: 0 }
+    local dist = { nuggets = 0, ingots = 0, blocks = 0 }
     for _, item in pairs(items) do
         local type, form = item.name:match".-:(%l-)_(%l*)"
         if type == item_type and dist[form] ~= nil then
@@ -134,15 +134,15 @@ end
 
 function get_diff (dist1, dist2)
     return {
-        nuggets: dist1.nuggets - dist2.nuggets,
-        ingots: dist1.ingots - dist2.ingots,
-        blocks: dist1.blocks - dist2.blocks
+        nuggets = dist1.nuggets - dist2.nuggets,
+        ingots = dist1.ingots - dist2.ingots,
+        blocks = dist1.blocks - dist2.blocks
     }
 end
 
 function filter_clamp (diff, current_dist)
     -- reduce diff numbers to what can be crafted using current resources
-    local new_diff = { nuggets: 0, ingots: 0, blocks: 0 }
+    local new_diff = { nuggets = 0, ingots = 0, blocks = 0 }
     if diff.blocks > 0 then
         new_diff.blocks = math.min(
             diff.blocks,