diff --git a/heightmap.lua b/heightmap.lua
index d6b2303..35b2737 100644
--- a/heightmap.lua
+++ b/heightmap.lua
@@ -60,7 +60,7 @@ local function heightmaps(minp, maxp)
 				local depth_factor_max = 0
 				local imax = 0
 				for i=1, 8 do
-					if depth_factors[i] >= depth_factor_max then
+					if depth_factors[i] > depth_factor_max then
 						depth_factor_max = depth_factors[i]
 						imax = i
 					end