diff --git a/minetestforfun_game/mods/default/mapgen.lua b/minetestforfun_game/mods/default/mapgen.lua
index 9c551ed3..0668d41d 100755
--- a/minetestforfun_game/mods/default/mapgen.lua
+++ b/minetestforfun_game/mods/default/mapgen.lua
@@ -1127,7 +1127,7 @@ function default.register_mgv6_decorations()
 		y_max = 1,
 		decoration = "default:papyrus",
 		height = 2,
-		height_max = 4,
+		y_max = 4,
 		spawn_by = "default:water_source",
 		num_spawn_by = 1,
 	})
@@ -1150,7 +1150,7 @@ function default.register_mgv6_decorations()
 		y_max = 30,
 		decoration = "default:cactus",
 		height = 3,
-	        height_max = 4,
+	        y_max = 4,
 	})
 
 	-- Long grasses
@@ -1377,7 +1377,7 @@ function default.register_decorations()
 		y_max = 31000,
 		decoration = "default:cactus",
 		height = 2,
-		height_max = 5,
+		y_max = 5,
 	})
 
 	-- Papyrus
diff --git a/mods/sea/clams/init.lua b/mods/sea/clams/init.lua
index 092409d7..157034de 100755
--- a/mods/sea/clams/init.lua
+++ b/mods/sea/clams/init.lua
@@ -160,8 +160,8 @@ minetest.register_ore({
 	clust_scarcity = 9*9*9,
 	clust_num_ores = 16,
 	clust_size     = 4,
-	height_max     = -4,
-	height_min     = -60,
+	y_max          = -4,
+	y_min          = -60,
 })
 
 minetest.register_ore({
@@ -171,8 +171,8 @@ minetest.register_ore({
 	clust_scarcity = 9*9*9,
 	clust_num_ores = 16,
 	clust_size     = 4,
-	height_max     = -4,
-	height_min     = -60,
+	y_max          = -4,
+	y_min          = -60,
 })
 
 
diff --git a/mods/sea/seawrecks/init.lua b/mods/sea/seawrecks/init.lua
index 098a89fd..cde17ec5 100755
--- a/mods/sea/seawrecks/init.lua
+++ b/mods/sea/seawrecks/init.lua
@@ -157,8 +157,8 @@ minetest.register_ore({
 	clust_scarcity = 30*30*30,
 	clust_num_ores = 1,
 	clust_size     = 12,
-	height_max     = -4,
-	height_min     = -31000,
+	y_max          = -4,
+	y_min          = -31000,
 })
 
 minetest.register_ore({
@@ -168,8 +168,8 @@ minetest.register_ore({
 	clust_scarcity = 30*30*30,
 	clust_num_ores = 1,
 	clust_size     = 12,
-	height_max     = -8,
-	height_min     = -31000,
+	y_max          = -8,
+	y_min          = -31000,
 })
 
 local function generate_ore(name, wherein, minp, maxp, seed, chunks_per_volume, chunk_size, ore_per_chunk, height_min, height_max)
diff --git a/mods/sea/whiteshell/init.lua b/mods/sea/whiteshell/init.lua
index ffc10ac6..73c30cef 100755
--- a/mods/sea/whiteshell/init.lua
+++ b/mods/sea/whiteshell/init.lua
@@ -32,8 +32,8 @@ minetest.register_ore({
 	clust_scarcity = 10*10*10,
 	clust_num_ores = 18,
 	clust_size     = 6,
-	height_max     = 31000,
-	height_min     = -31000,
+	y_max          = 31000,
+	y_min          = -31000,
 })