diff --git a/GUI/Model/XML/Serialize.h b/GUI/Model/XML/Serialize.h
index d294beced245d47891faef01bb99bbee38295521..a9036c7e0ecdaa2fae14af1ac12fe1d3731a984f 100644
--- a/GUI/Model/XML/Serialize.h
+++ b/GUI/Model/XML/Serialize.h
@@ -16,6 +16,7 @@
 #define BORNAGAIN_GUI_MODEL_XML_SERIALIZE_H
 
 #include "GUI/Model/XML/Streamer.h"
+#include "GUI/Model/Descriptor/SelectionProperty.h"
 
 //! Functions to serialize various data types.
 //!
diff --git a/GUI/Model/XML/Streamer.h b/GUI/Model/XML/Streamer.h
index a779de2b125772d39e25d79a36064ccd89512c03..69edec3b3866661ab7f3404f245a9ab2ca538c2f 100644
--- a/GUI/Model/XML/Streamer.h
+++ b/GUI/Model/XML/Streamer.h
@@ -15,7 +15,7 @@
 #ifndef BORNAGAIN_GUI_MODEL_XML_STREAMER_H
 #define BORNAGAIN_GUI_MODEL_XML_STREAMER_H
 
-#include "GUI/Model/Descriptor/SelectionProperty.h"
+#include "Base/Util/Assert.h"
 #include <QXmlStreamWriter> // used in every including file
 #include <functional>
 #include <heinz/Vectors3D.h>