diff --git a/GUI/Models/BackgroundItems.cpp b/GUI/Models/BackgroundItems.cpp
index 5925b6c722784b1bb4d9db7b6383d28282b792c7..a5ae25b91a59bf9f53e43398e4d7a80327d27452 100644
--- a/GUI/Models/BackgroundItems.cpp
+++ b/GUI/Models/BackgroundItems.cpp
@@ -35,7 +35,7 @@ namespace {
 const QString constant_background_value_tooltip = "Constant background value [counts/pixel]";
 }
 
-const QString ConstantBackgroundItem::P_VALUE = QString::fromStdString("BackgroundValue");
+const QString ConstantBackgroundItem::P_VALUE = "BackgroundValue";
 
 ConstantBackgroundItem::ConstantBackgroundItem() : BackgroundItem("ConstantBackground")
 {
@@ -49,6 +49,11 @@ std::unique_ptr<IBackground> ConstantBackgroundItem::createBackground() const
     return std::make_unique<ConstantBackground>(getItemValue(P_VALUE).toDouble());
 }
 
+void ConstantBackgroundItem::setBackgroundValue(double value)
+{
+    setItemValue(P_VALUE, value);
+}
+
 // Background consisting of Poisson noise
 /* ------------------------------------------------ */
 
diff --git a/GUI/Models/BackgroundItems.h b/GUI/Models/BackgroundItems.h
index 85c0056a986a1d84bb47f1375a53cebc017abf9e..96b3f83b75610952c8a41a8d1fa42a6fb51db6a1 100644
--- a/GUI/Models/BackgroundItems.h
+++ b/GUI/Models/BackgroundItems.h
@@ -33,11 +33,13 @@ public:
 };
 
 class BA_CORE_API_ ConstantBackgroundItem : public BackgroundItem {
-public:
+private:
     static const QString P_VALUE;
 
+public:
     ConstantBackgroundItem();
     std::unique_ptr<IBackground> createBackground() const;
+    void setBackgroundValue(double value);
 };
 
 class BA_CORE_API_ PoissonNoiseBackgroundItem : public BackgroundItem {
diff --git a/GUI/Models/TransformFromDomain.cpp b/GUI/Models/TransformFromDomain.cpp
index 14ecf8eb04a353bdf2cd6415e8ad22b78f797e32..02f3ea4abc063e7b3d7b59c9b489b175bc0262f8 100644
--- a/GUI/Models/TransformFromDomain.cpp
+++ b/GUI/Models/TransformFromDomain.cpp
@@ -558,10 +558,11 @@ void TransformFromDomain::setBackground(InstrumentItem* instrument_item,
 {
     auto p_bg = simulation.background();
     if (auto p_constant_bg = dynamic_cast<const ConstantBackground*>(p_bg)) {
-        auto constant_bg_item =
-            instrument_item->setGroupProperty(InstrumentItem::P_BACKGROUND, "ConstantBackground");
+        ConstantBackgroundItem* constant_bg_item =
+            dynamic_cast<ConstantBackgroundItem*>
+            (instrument_item->setGroupProperty(InstrumentItem::P_BACKGROUND, "ConstantBackground"));
         double value = p_constant_bg->backgroundValue();
-        constant_bg_item->setItemValue(ConstantBackgroundItem::P_VALUE, value);
+        constant_bg_item->setBackgroundValue(value);
     } else if (dynamic_cast<const PoissonNoiseBackground*>(p_bg)) {
         instrument_item->setGroupProperty(InstrumentItem::P_BACKGROUND, "PoissonNoiseBackground");
     }