diff --git a/src/support/ctlikelihood.cpp b/src/support/ctlikelihood.cpp
index 6fa29a3..e800bf6 100755
--- a/src/support/ctlikelihood.cpp
+++ b/src/support/ctlikelihood.cpp
@@ -28,6 +28,8 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+#include <string>
+#include <typeinfo>
 #include "ctlikelihood.hpp"
 
 /* __ Method name definitions ____________________________________________ */
diff --git a/src/support/ctobservation.cpp b/src/support/ctobservation.cpp
index 8241dd9..03f1386 100755
--- a/src/support/ctobservation.cpp
+++ b/src/support/ctobservation.cpp
@@ -1,7 +1,7 @@
 /***************************************************************************
  *             ctobservation - Base class for observation tools            *
  * ----------------------------------------------------------------------- *
- *  copyright (C) 2016-2019 by Juergen Knoedlseder                         *
+ *  copyright (C) 2016-2021 by Juergen Knoedlseder                         *
  * ----------------------------------------------------------------------- *
  *                                                                         *
  *  This program is free software: you can redistribute it and/or modify   *
@@ -28,6 +28,7 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+#include <string>
 #include "ctobservation.hpp"
 
 /* __ Method name definitions ____________________________________________ */