diff --git a/compacting-storage.lua b/compacting-storage.lua
index 7943108..a271252 100644
--- a/compacting-storage.lua
+++ b/compacting-storage.lua
@@ -153,6 +153,7 @@ function should_fill (type, counts)
     else
         amount_to_use = amount_spare
     end
+    if fill_src == "nugget" and fill_dest == "block" then return end
     return fill_dest, fill_src, amount_to_use * REDUCTION_FACTOR
 end