diff --git a/generator/src/main/java/io/github/lonamiwebs/overgram/generator/Generator.java b/generator/src/main/java/io/github/lonamiwebs/overgram/generator/Generator.java
index d71cb98..5ba69b1 100644
--- a/generator/src/main/java/io/github/lonamiwebs/overgram/generator/Generator.java
+++ b/generator/src/main/java/io/github/lonamiwebs/overgram/generator/Generator.java
@@ -75,6 +75,7 @@ public class Generator {
                     writer.write(extendsName);
                 }
                 writer.write(" {\n");
+                writer.write("public static final int CONSTRUCTOR_ID = " + object.code + ";\n");
 
                 for (int i = 0; i < object.args.size(); ++i) {
                     final TLArg arg = object.args.get(i);
@@ -148,6 +149,7 @@ public class Generator {
 
     private static void writeSerialize(final Writer writer, final TLObject object) throws IOException {
         writer.write("public void serialize(final BinaryWriter writer) {\n");
+        writer.write("writer.write(CONSTRUCTOR_ID);\n");
         for (final TLArg arg : object.args) {
             if (!arg.genericDefinition && arg.flags) {
                 writer.write("int ");