diff --git a/Object.mqh b/Object.mqh
index ed889e2a8..acee5760b 100644
--- a/Object.mqh
+++ b/Object.mqh
@@ -24,9 +24,7 @@
 #ifndef OBJECT_MQH
 #define OBJECT_MQH
 
-#ifdef __MQL4__
 #define nullptr NULL
-#endif
 
 // Includes.
 #include "Object.enum.h"
diff --git a/SerializerConverter.mqh b/SerializerConverter.mqh
index 750f338bb..afe169734 100644
--- a/SerializerConverter.mqh
+++ b/SerializerConverter.mqh
@@ -30,6 +30,7 @@ class SerializerNode;
 
 // Includes.
 #include "File.mqh"
+#include "Object.mqh"
 #include "Serializer.enum.h"
 #include "Serializer.mqh"
 #include "SerializerNode.mqh"