diff --git a/src/gui/gui.zig b/src/gui/gui.zig
index 5784fe15..038e38d6 100644
--- a/src/gui/gui.zig
+++ b/src/gui/gui.zig
@@ -217,7 +217,18 @@ pub fn save() void { // MARK: save()
 		guiZon.put(window.id, windowZon);
 	}
 
-	main.files.cubyzDir().writeZon("gui_layout.zig.zon", guiZon) catch |err| {
+	// Merge with the old settings file to preserve unknown settings.
+	const oldZon: ZonElement = main.files.cubyzDir().readToZon(main.stackAllocator, "gui_layout.zig.zon") catch |err| blk: {
+		if(err != error.FileNotFound) {
+			std.log.err("Could not read gui_layout.zig.zon: {s}", .{@errorName(err)});
+		}
+		break :blk .null;
+	};
+	defer oldZon.deinit(main.stackAllocator);
+
+	oldZon.join(guiZon);
+
+	main.files.cubyzDir().writeZon("gui_layout.zig.zon", oldZon) catch |err| {
 		std.log.err("Could not write gui_layout.zig.zon: {s}", .{@errorName(err)});
 	};
 }
diff --git a/src/settings.zig b/src/settings.zig
index 85a157b7..e4b66810 100644
--- a/src/settings.zig
+++ b/src/settings.zig
@@ -153,8 +153,18 @@ pub fn save() void {
 	}
 	zonObject.put("keyboard", keyboard);
 
-	// Write to file:
-	main.files.cubyzDir().writeZon(settingsFile, zonObject) catch |err| {
+	// Merge with the old settings file to preserve unknown settings.
+	const oldZonObject: ZonElement = main.files.cubyzDir().readToZon(main.stackAllocator, settingsFile) catch |err| blk: {
+		if(err != error.FileNotFound) {
+			std.log.err("Could not read settings file: {s}", .{@errorName(err)});
+		}
+		break :blk .null;
+	};
+	defer oldZonObject.deinit(main.stackAllocator);
+
+	oldZonObject.join(zonObject);
+
+	main.files.cubyzDir().writeZon(settingsFile, oldZonObject) catch |err| {
 		std.log.err("Couldn't write settings to file: {s}", .{@errorName(err)});
 	};
 }