diff --git a/mods/default/mapgen.lua b/mods/default/mapgen.lua
index 8c161d1e..e5df6331 100644
--- a/mods/default/mapgen.lua
+++ b/mods/default/mapgen.lua
@@ -542,7 +542,7 @@ function default.register_ores()
 		clust_scarcity  = 16 * 16 * 16,
 		clust_size      = 5,
 		y_max           = 31000,
-		y_min           = -31000,
+		y_min           = -30000,
 		noise_threshold = 0.0,
 		noise_params    = {
 			offset = 0.5,
@@ -588,7 +588,7 @@ function default.register_ores()
 		clust_scarcity  = 16 * 16 * 16,
 		clust_size      = 5,
 		y_max           = 31000,
-		y_min           = -31000,
+		y_min           = -30000,
 		noise_threshold = 0.0,
 		noise_params    = {
 			offset = 0.5,