diff --git a/src/main.lua b/src/main.lua
index 24516a8..3a82cf9 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -101,6 +101,7 @@ local function fill(ntype, x,y,z, buf, sx,sz)
         local newneigh = fill_getneighbors(cx,y,cz, sx,sz, inittype,buf)
         for _,v in pairs(newneigh) do
             table.insert(neighbors, v)
+            buf[posasstring(v[1],y,v[2])] = ntype
             totalneighbors = totalneighbors + 1
         end
         buf[posasstring(cx,y,cz)] = ntype