diff --git a/GUI/View/Instrument/InstrumentListing.cpp b/GUI/View/Instrument/InstrumentListing.cpp
index 031792d7af2184218ca62753edf16c37657ab920..6dbcd49679b3a6ee4aa2e91ee34ab1fa39da5767 100644
--- a/GUI/View/Instrument/InstrumentListing.cpp
+++ b/GUI/View/Instrument/InstrumentListing.cpp
@@ -21,9 +21,8 @@
 #include <QMessageBox>
 #include <QVBoxLayout>
 
-InstrumentListing::InstrumentListing(ProjectDocument* document)
-    : m_document(document)
-    , m_model(new InstrumentListModel(this, m_document->multiNotifier()))
+InstrumentListing::InstrumentListing()
+    : m_model(new InstrumentListModel(this, gDoc->multiNotifier()))
     , m_separatorAction1(new QAction(this))
     , m_separatorAction2(new QAction(this))
 {
@@ -141,7 +140,7 @@ void InstrumentListing::onItemSelectionChanged()
     QModelIndexList indexes = selectionModel()->selectedIndexes();
     if (!indexes.empty()) {
         QModelIndex current = indexes.front();
-        m_document->instrumentModel()->setSelectedIndex(current.row());
+        gDoc->instrumentModel()->setSelectedIndex(current.row());
         emit instrumentSelected(m_model->instrumentItemForIndex(current));
     } else
         emit instrumentSelected(nullptr);
@@ -240,7 +239,7 @@ void InstrumentListing::ensureItemSelected()
 
 void InstrumentListing::restoreSelection()
 {
-    int lastUsed = m_document->instrumentModel()->selectedIndex();
+    int lastUsed = gDoc->instrumentModel()->selectedIndex();
     if (lastUsed >= 0 && lastUsed < m_model->rowCount()) {
         QModelIndex lastUsedIndex = m_model->index(lastUsed, 0, QModelIndex());
         selectionModel()->select(lastUsedIndex, QItemSelectionModel::ClearAndSelect);
diff --git a/GUI/View/Instrument/InstrumentListing.h b/GUI/View/Instrument/InstrumentListing.h
index 8e9af7cd2c55848c7a94a90396b49f88fb6b81be..59a74d0442e81354d67708ca1fe48278e26f7972 100644
--- a/GUI/View/Instrument/InstrumentListing.h
+++ b/GUI/View/Instrument/InstrumentListing.h
@@ -20,14 +20,13 @@
 
 class InstrumentItem;
 class InstrumentListModel;
-class ProjectDocument;
 
 //! Instrument selector on the left side of InstrumentView.
 
 class InstrumentListing : public QListView {
     Q_OBJECT
 public:
-    InstrumentListing(ProjectDocument* document);
+    InstrumentListing();
     ~InstrumentListing();
 
     QSize sizeHint() const override;
@@ -60,7 +59,6 @@ private:
 
 private:
     InstrumentLibrary m_instrumentLibrary;
-    ProjectDocument* m_document;
     InstrumentListModel* m_model;
     QAction* m_newGisasAction;
     QAction* m_newOffspecAction;
diff --git a/GUI/View/Instrument/InstrumentView.cpp b/GUI/View/Instrument/InstrumentView.cpp
index 15e9998fcfa81dab4795bb37d29b814c6cc3ca35..b1de60967de0e91b3ebaa10a138b6f15289aa262 100644
--- a/GUI/View/Instrument/InstrumentView.cpp
+++ b/GUI/View/Instrument/InstrumentView.cpp
@@ -14,6 +14,7 @@
 
 #include "GUI/View/Instrument/InstrumentView.h"
 #include "GUI/Model/Device/InstrumentItems.h"
+#include "GUI/Model/Project/ProjectDocument.h"
 #include "GUI/View/Instrument/DepthprobeInstrumentEditor.h"
 #include "GUI/View/Instrument/GISASInstrumentEditor.h"
 #include "GUI/View/Instrument/InstrumentListing.h"
@@ -27,7 +28,7 @@
 #include <QTextEdit>
 
 InstrumentView::InstrumentView()
-    : m_listing(new InstrumentListing(gDoc.get()))
+    : m_listing(new InstrumentListing)
     , m_scrollArea(new QScrollArea)
 {
     auto* layout = new QVBoxLayout(this);
diff --git a/GUI/View/Instrument/InstrumentView.h b/GUI/View/Instrument/InstrumentView.h
index 58c1be3c9645fbc85467b744e201477fc5a3dea7..aac435d6cb0fa908aa1bf5cc239821da85f314bd 100644
--- a/GUI/View/Instrument/InstrumentView.h
+++ b/GUI/View/Instrument/InstrumentView.h
@@ -15,14 +15,12 @@
 #ifndef BORNAGAIN_GUI_VIEW_INSTRUMENT_INSTRUMENTVIEW_H
 #define BORNAGAIN_GUI_VIEW_INSTRUMENT_INSTRUMENTVIEW_H
 
-#include "GUI/Model/Project/ProjectDocument.h" // ProjectDocument::Functionalities
 #include <QCheckBox>
 #include <QScrollArea>
 #include <QWidget>
 
 class InstrumentItem;
 class InstrumentListing;
-class ProjectDocument;
 
 class InstrumentView : public QWidget {
     Q_OBJECT