diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5cc509..a3cdfd9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ Note to self: See the bottom of this file for the release template text.
  - Add `//metaball`, which renders 2 or more [metaballs](https://en.wikipedia.org/wiki/Metaballs) in Minetest
  - Migrate from `depends.txt` to `mod.conf`
  - `//sculpt`: Fix undefined `default` brush
+ - Commands that modify the terrain now ignore liquids
 
 
 ## v1.13: The transformational update (2nd January 2022)
diff --git a/worldeditadditions/utils/terrain/make_heightmap.lua b/worldeditadditions/utils/terrain/make_heightmap.lua
index 1b3c67b..c69821b 100644
--- a/worldeditadditions/utils/terrain/make_heightmap.lua
+++ b/worldeditadditions/utils/terrain/make_heightmap.lua
@@ -23,7 +23,7 @@ local function make_heightmap(pos1, pos2, manip, area, data)
 			-- Scan each column top to bottom
 			for y = pos2.y+1, pos1.y, -1 do
 				local i = area:index(x, y, z)
-				if not (wea.is_airlike(data[i]) or wea.is_liquidlike(data[i])) then
+				if not (wea.is_airlike(data[i]) and not wea.is_liquidlike(data[i])) then
 					-- It's the first non-airlike node in this column
 					-- Start heightmap values from 1 (i.e. there's at least 1 node in the column)
 					heightmap[hi] = (y - pos1.y) + 1