diff --git a/mine.lua b/mine.lua
index 1d91d63..e680822 100644
--- a/mine.lua
+++ b/mine.lua
@@ -286,6 +286,9 @@ function splitHorizontal (block)
     -- Future work: potentially split a large block into smaller blocks
     -- based on currentPos (think splitting down the middle instead of
     -- splitting off of one end)
+    local differentSigns = function (a, b)
+        return math.abs(a + b) < math.abs(a) + math.abs(b)
+    end
     local bigBlock = function (block)
         return (block.v2.x >= BIG_DIM) and (block.v2.z >= BIG_DIM)
     end