diff --git a/src/main.lua b/src/main.lua
index e8e2aad..85ce3a2 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -95,7 +95,7 @@ local function fill(ntype, x,y,z, buf, sx,sz)
         local cx,cz = cn[1],cn[2]
         local newneigh = fill_getneighbors(cx,y,cz, sx,sz, inittype,buf)
         for _,v in pairs(newneigh) do
-            table.insert(neighbors, newneigh)
+            table.insert(neighbors, v)
         end
         buf[posasstring(x,y,z)] = ntype
     end