diff --git a/include/ArduinoJson/Internals/JsonWriter.hpp b/include/ArduinoJson/Internals/JsonWriter.hpp
index 629d2f16..7b398023 100644
--- a/include/ArduinoJson/Internals/JsonWriter.hpp
+++ b/include/ArduinoJson/Internals/JsonWriter.hpp
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "../Arduino/Print.hpp"
+#include "QuotedString.hpp"
 
 namespace ArduinoJson {
 namespace Internals {
@@ -35,14 +36,22 @@ class JsonWriter {
   void endObject() { write('}'); }
   void writeEmptyObject() { write("{}"); }
 
-  void writeString(const char *value);
-  void writeInteger(long value);
-  void writeBoolean(bool value);
-  void writeDouble(double value, uint8_t decimals);
-
   void writeColon() { write(':'); }
   void writeComma() { write(','); }
 
+  void writeString(const char *value) {
+    _length += QuotedString::printTo(value, _sink);
+  }
+
+  void writeInteger(long value) { _length += _sink.print(value); }
+
+  void writeBoolean(bool value) {
+    _length += _sink.print(value ? "true" : "false");
+  }
+  void writeDouble(double value, uint8_t decimals) {
+    _length += _sink.print(value, decimals);
+  }
+
  protected:
   void write(char c) { _length += _sink.write(c); }
   void write(const char *s) { _length += _sink.print(s); }
diff --git a/src/Internals/JsonWriter.cpp b/src/Internals/JsonWriter.cpp
deleted file mode 100644
index 3124ae01..00000000
--- a/src/Internals/JsonWriter.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright Benoit Blanchon 2014
-// MIT License
-//
-// Arduino JSON library
-// https://github.com/bblanchon/ArduinoJson
-
-#include "../../include/ArduinoJson/Internals/JsonWriter.hpp"
-
-#include "../../include/ArduinoJson/Internals/QuotedString.hpp"
-
-using namespace ArduinoJson::Internals;
-
-void JsonWriter::writeString(char const *value) {
-  _length += QuotedString::printTo(value, _sink);
-}
-
-void JsonWriter::writeInteger(long value) { _length += _sink.print(value); }
-
-void JsonWriter::writeBoolean(bool value) {
-  _length += _sink.print(value ? "true" : "false");
-}
-
-void JsonWriter::writeDouble(double value, uint8_t decimals) {
-  _length += _sink.print(value, decimals);
-}