diff --git a/src/serializer.cc b/src/serializer.cc
index 041f1cea..c88d28d5 100644
--- a/src/serializer.cc
+++ b/src/serializer.cc
@@ -12,7 +12,8 @@ namespace {
 bool gTestOutputMode = false;
 }  // namespace
 
-// uint8_t
+//// Elementary types
+
 void Reflect(Reader& visitor, uint8_t& value) {
   value = (uint8_t)visitor.GetInt();
 }
@@ -20,7 +21,6 @@ void Reflect(Writer& visitor, uint8_t& value) {
   visitor.Int(value);
 }
 
-// int16_t
 void Reflect(Reader& visitor, int16_t& value) {
   value = (int16_t)visitor.GetInt();
 }
@@ -28,7 +28,6 @@ void Reflect(Writer& visitor, int16_t& value) {
   visitor.Int(value);
 }
 
-// int32_t
 void Reflect(Reader& visitor, int32_t& value) {
   value = visitor.GetInt();
 }
@@ -36,7 +35,13 @@ void Reflect(Writer& visitor, int32_t& value) {
   visitor.Int(value);
 }
 
-// int64_t
+void Reflect(Reader& visitor, uint32_t& value) {
+  value = visitor.GetUint32();
+}
+void Reflect(Writer& visitor, uint32_t& value) {
+  visitor.Uint32(value);
+}
+
 void Reflect(Reader& visitor, int64_t& value) {
   value = visitor.GetInt64();
 }
@@ -44,7 +49,6 @@ void Reflect(Writer& visitor, int64_t& value) {
   visitor.Int64(value);
 }
 
-// uint64_t
 void Reflect(Reader& visitor, uint64_t& value) {
   value = visitor.GetUint64();
 }
@@ -52,7 +56,6 @@ void Reflect(Writer& visitor, uint64_t& value) {
   visitor.Uint64(value);
 }
 
-// double
 void Reflect(Reader& visitor, double& value) {
   value = visitor.GetDouble();
 }
@@ -60,7 +63,6 @@ void Reflect(Writer& visitor, double& value) {
   visitor.Double(value);
 }
 
-// bool
 void Reflect(Reader& visitor, bool& value) {
   value = visitor.GetBool();
 }
diff --git a/src/serializer.h b/src/serializer.h
index 2e66737f..dfe6252e 100644
--- a/src/serializer.h
+++ b/src/serializer.h
@@ -30,6 +30,7 @@ class Reader {
   virtual void GetNull() = 0;
   virtual bool GetBool() = 0;
   virtual int GetInt() = 0;
+  virtual uint32_t GetUint32() = 0;
   virtual int64_t GetInt64() = 0;
   virtual uint64_t GetUint64() = 0;
   virtual double GetDouble() = 0;
@@ -50,6 +51,7 @@ class Writer {
   virtual void Null() = 0;
   virtual void Bool(bool x) = 0;
   virtual void Int(int x) = 0;
+  virtual void Uint32(uint32_t x) = 0;
   virtual void Int64(int64_t x) = 0;
   virtual void Uint64(uint64_t x) = 0;
   virtual void Double(double x) = 0;
@@ -153,6 +155,9 @@ void Reflect(Writer& visitor, int16_t& value);
 void Reflect(Reader& visitor, int32_t& value);
 void Reflect(Writer& visitor, int32_t& value);
 
+void Reflect(Reader& visitor, uint32_t& value);
+void Reflect(Writer& visitor, uint32_t& value);
+
 void Reflect(Reader& visitor, int64_t& value);
 void Reflect(Writer& visitor, int64_t& value);
 
diff --git a/src/serializers/json.h b/src/serializers/json.h
index 297e188f..67cb53b0 100644
--- a/src/serializers/json.h
+++ b/src/serializers/json.h
@@ -23,6 +23,7 @@ class JsonReader : public Reader {
   void GetNull() override {}
   bool GetBool() override { return m_->GetBool(); }
   int GetInt() override { return m_->GetInt(); }
+  uint32_t GetUint32() override { return uint32_t(m_->GetUint64()); }
   int64_t GetInt64() override { return m_->GetInt64(); }
   uint64_t GetUint64() override { return m_->GetUint64(); }
   double GetDouble() override { return m_->GetDouble(); }
@@ -64,6 +65,7 @@ class JsonWriter : public Writer {
   void Null() override { m_->Null(); }
   void Bool(bool x) override { m_->Bool(x); }
   void Int(int x) override { m_->Int(x); }
+  void Uint32(uint32_t x) override { m_->Uint64(x); }
   void Int64(int64_t x) override { m_->Int64(x); }
   void Uint64(uint64_t x) override { m_->Uint64(x); }
   void Double(double x) override { m_->Double(x); }
diff --git a/src/serializers/msgpack.h b/src/serializers/msgpack.h
index df55a9da..91b08667 100644
--- a/src/serializers/msgpack.h
+++ b/src/serializers/msgpack.h
@@ -33,6 +33,7 @@ class MessagePackReader : public Reader {
   void GetNull() override { pk_->next(oh_); }
   bool GetBool() override { return Get<bool>(); }
   int GetInt() override { return Get<int>(); }
+  uint32_t GetUint32() override { return Get<uint32_t>(); }
   int64_t GetInt64() override { return Get<int64_t>(); }
   uint64_t GetUint64() override { return Get<uint64_t>(); }
   double GetDouble() override { return Get<double>(); }
@@ -64,6 +65,7 @@ class MessagePackWriter : public Writer {
   void Null() override { m_->pack_nil(); }
   void Bool(bool x) override { m_->pack(x); }
   void Int(int x) override { m_->pack(x); }
+  void Uint32(uint32_t x) override { m_->pack(x); }
   void Int64(int64_t x) override { m_->pack(x); }
   void Uint64(uint64_t x) override { m_->pack(x); }
   void Double(double x) override { m_->pack(x); }