diff --git a/integration-tests/src/main/java/io/quarkiverse/fury/it/Foo.java b/integration-tests/src/main/java/io/quarkiverse/fury/it/Foo.java
index d0ac0f0..d740be5 100644
--- a/integration-tests/src/main/java/io/quarkiverse/fury/it/Foo.java
+++ b/integration-tests/src/main/java/io/quarkiverse/fury/it/Foo.java
@@ -24,6 +24,6 @@
 
 import io.quarkiverse.fury.FurySerialization;
 
-@FurySerialization
+@FurySerialization(classId = 300)
 public record Foo(int f1, String f2, List<String> f3, Map<String, Long> f4) {
 }
diff --git a/runtime/src/main/java/io/quarkiverse/fury/FuryRecorder.java b/runtime/src/main/java/io/quarkiverse/fury/FuryRecorder.java
index 57acc16..8218453 100644
--- a/runtime/src/main/java/io/quarkiverse/fury/FuryRecorder.java
+++ b/runtime/src/main/java/io/quarkiverse/fury/FuryRecorder.java
@@ -27,9 +27,9 @@ public RuntimeValue<BaseFury> createFury(
     }
 
     public void registerClass(
-            final RuntimeValue<BaseFury> fury, final Class<?> clazz,
+            final RuntimeValue<BaseFury> furyValue, final Class<?> clazz,
             final int classId, Class<? extends Serializer> serializer) {
-        BaseFury furyValue = fury.getValue();
+        BaseFury fury = furyValue.getValue();
         if (classId > 0) {
             Preconditions.checkArgument(
                     classId >= 256 && classId <= Short.MAX_VALUE,
@@ -38,12 +38,12 @@ public void registerClass(
                     Short.MAX_VALUE);
             Class<?> registeredClass;
             if (fury instanceof ThreadSafeFury) {
-                ThreadSafeFury threadSafeFury = (ThreadSafeFury) furyValue;
+                ThreadSafeFury threadSafeFury = (ThreadSafeFury) fury;
                 registeredClass = (threadSafeFury).execute(f -> f.getClassResolver().getRegisteredClass((short) classId));
                 // Generate serializer bytecode.
                 threadSafeFury.execute(f -> f.getClassResolver().getSerializerClass(clazz));
             } else {
-                ClassResolver classResolver = ((Fury) furyValue).getClassResolver();
+                ClassResolver classResolver = ((Fury) fury).getClassResolver();
                 registeredClass = classResolver.getRegisteredClass((short) classId);
                 // Generate serializer bytecode.
                 classResolver.getSerializerClass(clazz);
@@ -53,12 +53,13 @@ public void registerClass(
                     "ClassId %s has been registered for class %s",
                     classId,
                     registeredClass);
+            fury.register(clazz, (short) classId);
         } else {
             // Generate serializer bytecode.
-            furyValue.register(clazz, true);
+            fury.register(clazz, true);
         }
         if (serializer != null) {
-            furyValue.registerSerializer(clazz, serializer);
+            fury.registerSerializer(clazz, serializer);
         }
     }
 }