diff --git a/app/scanner2/graphicsscene.cpp b/app/scanner2/graphicsscene.cpp
index 7ddaf43a..b74f7167 100644
--- a/app/scanner2/graphicsscene.cpp
+++ b/app/scanner2/graphicsscene.cpp
@@ -9,6 +9,7 @@
 #include <QGraphicsView>    
 #include <typeinfo>
 #include <math.h>
+#include "assert.h"
 
 GraphicsTextEdit::GraphicsTextEdit(QWidget* parent)
     : QTextEdit(parent)