diff --git a/res/scripts/stdcmd.lua b/res/scripts/stdcmd.lua
index 779ad50bf..c2b102675 100644
--- a/res/scripts/stdcmd.lua
+++ b/res/scripts/stdcmd.lua
@@ -133,6 +133,9 @@ console.add_command(
     "Fill specified zone with blocks",
     function(args, kwargs)
         local name, x1,y1,z1, x2,y2,z2 = unpack(args)
+        x1, x2 = math.min(x1, x2), math.max(x1, x2)
+        y1, y2 = math.min(y1, y2), math.max(y1, y2)
+        z1, z2 = math.min(z1, z2), math.max(z1, z2)
         local id = block.index(name)
         for y=y1,y2 do
             for z=z1,z2 do