diff --git a/src/App/DocumentObject.cpp b/src/App/DocumentObject.cpp
index 409f6220ce..763a121ab9 100644
--- a/src/App/DocumentObject.cpp
+++ b/src/App/DocumentObject.cpp
@@ -38,7 +38,6 @@
 #include "DocumentObjectExtension.h"
 #include "GeoFeatureGroupExtension.h"
 #include <App/DocumentObjectPy.h>
-#include <boost/signals/connection.hpp>
 #include <boost/bind.hpp>
 
 using namespace App;
diff --git a/src/Mod/Sketcher/App/SketchObject.h b/src/Mod/Sketcher/App/SketchObject.h
index 50d8c0b707..895b4c3d93 100644
--- a/src/Mod/Sketcher/App/SketchObject.h
+++ b/src/Mod/Sketcher/App/SketchObject.h
@@ -23,7 +23,6 @@
 #ifndef SKETCHER_SKETCHOBJECT_H
 #define SKETCHER_SKETCHOBJECT_H
 
-#include <boost/signals/connection.hpp>
 #include <App/PropertyStandard.h>
 #include <App/PropertyFile.h>
 #include <App/FeaturePython.h>
diff --git a/src/Mod/Spreadsheet/Gui/SheetModel.h b/src/Mod/Spreadsheet/Gui/SheetModel.h
index 6c2cb8dade..5e418ac067 100644
--- a/src/Mod/Spreadsheet/Gui/SheetModel.h
+++ b/src/Mod/Spreadsheet/Gui/SheetModel.h
@@ -24,7 +24,6 @@
 #define SHEETMODEL_H
 
 #include <QAbstractTableModel>
-#include <boost/signals/connection.hpp>
 #include <Mod/Spreadsheet/App/Utils.h>
 #include <App/Range.h>
 
diff --git a/src/Mod/Spreadsheet/Gui/SheetTableView.h b/src/Mod/Spreadsheet/Gui/SheetTableView.h
index 31fd94b787..abf0377861 100644
--- a/src/Mod/Spreadsheet/Gui/SheetTableView.h
+++ b/src/Mod/Spreadsheet/Gui/SheetTableView.h
@@ -26,7 +26,6 @@
 #include <QTableView>
 #include <QHeaderView>
 #include <QKeyEvent>
-#include <boost/signals/connection.hpp>
 #include <Mod/Spreadsheet/App/Sheet.h>
 #include <Mod/Spreadsheet/App/Utils.h>