diff --git a/src/renderer/Thread.zig b/src/renderer/Thread.zig
index 178dca14e..447d54d1a 100644
--- a/src/renderer/Thread.zig
+++ b/src/renderer/Thread.zig
@@ -327,7 +327,8 @@ fn drainMailbox(self: *Thread) !void {
             },
 
             .change_config => |config| {
-                defer message.deinit();
+                defer config.alloc.destroy(config.thread);
+                defer config.alloc.destroy(config.impl);
                 try self.changeConfig(config.thread);
                 try self.renderer.changeConfig(config.impl);