diff --git a/Subsurface-mobile.pro b/Subsurface-mobile.pro
index 47b447fa4..598e94e4c 100644
--- a/Subsurface-mobile.pro
+++ b/Subsurface-mobile.pro
@@ -28,7 +28,6 @@ SOURCES += subsurface-mobile-main.cpp \
 	core/qtserialbluetooth.cpp \
 	core/plannernotes.c \
 	core/uemis-downloader.c \
-	core/applicationstate.cpp \
 	core/qthelper.cpp \
 	core/checkcloudconnection.cpp \
 	core/color.cpp \
diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 0d400931d..c2103ab71 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -37,8 +37,6 @@ endif()
 
 # compile the core library part in C, part in C++
 set(SUBSURFACE_CORE_LIB_SRCS
-	applicationstate.cpp
-	applicationstate.h
 	checkcloudconnection.cpp
 	checkcloudconnection.h
 	cloudstorage.cpp
diff --git a/core/applicationstate.cpp b/core/applicationstate.cpp
deleted file mode 100644
index 05701cd32..000000000
--- a/core/applicationstate.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include "applicationstate.h"
-
-static ApplicationState appState = (ApplicationState)-1; // Set to an invalid value
-
-ApplicationState getAppState()
-{
-	return appState;
-}
-
-void setAppState(ApplicationState state)
-{
-	appState = state;
-}
diff --git a/core/applicationstate.h b/core/applicationstate.h
deleted file mode 100644
index c3a8f360d..000000000
--- a/core/applicationstate.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#ifndef APPLICATIONSTATE_H
-#define APPLICATIONSTATE_H
-
-// By using an enum class, the enum entries don't polute the global namespace.
-// Moreover, they are strongly typed. This means that they are not auto-converted
-// to integer types if e.g. used as array-indices.
-enum class ApplicationState {
-	Default,
-	EditDive,
-	PlanDive,
-	EditPlannedDive,
-	EditDiveSite,
-	FilterDive,
-	Statistics,
-	MapMaximized,
-	ProfileMaximized,
-	ListMaximized,
-	InfoMaximized,
-	Count
-};
-
-ApplicationState getAppState();
-void setAppState(ApplicationState state);
-
-#endif
diff --git a/core/qthelper.cpp b/core/qthelper.cpp
index d0a6e36db..702ee965d 100644
--- a/core/qthelper.cpp
+++ b/core/qthelper.cpp
@@ -13,7 +13,6 @@
 #include "planner.h"
 #include "subsurface-time.h"
 #include "gettextfromc.h"
-#include "applicationstate.h"
 #include "metadata.h"
 #include "exif.h"
 #include "file.h"
diff --git a/desktop-widgets/filterwidget.cpp b/desktop-widgets/filterwidget.cpp
index b6a1429fe..5c910ea72 100644
--- a/desktop-widgets/filterwidget.cpp
+++ b/desktop-widgets/filterwidget.cpp
@@ -181,7 +181,7 @@ void FilterWidget::clearFilter()
 
 void FilterWidget::closeFilter()
 {
-	MainWindow::instance()->setApplicationState(ApplicationState::Default);
+	MainWindow::instance()->setApplicationState(MainWindow::ApplicationState::Default);
 }
 
 FilterData FilterWidget::createFilterData() const
diff --git a/desktop-widgets/locationinformation.cpp b/desktop-widgets/locationinformation.cpp
index 780390198..2f5648461 100644
--- a/desktop-widgets/locationinformation.cpp
+++ b/desktop-widgets/locationinformation.cpp
@@ -219,7 +219,7 @@ void LocationInformationWidget::acceptChanges()
 
 	MainWindow::instance()->diveList->setEnabled(true);
 	MainWindow::instance()->setEnabledToolbar(true);
-	MainWindow::instance()->setApplicationState(ApplicationState::Default);
+	MainWindow::instance()->setApplicationState(MainWindow::ApplicationState::Default);
 	DiveFilter::instance()->stopFilterDiveSites();
 
 	// Subtlety alert: diveSite must be cleared *after* exiting the dive-site mode.
diff --git a/desktop-widgets/mainwindow.cpp b/desktop-widgets/mainwindow.cpp
index e2fb7368a..2a932d278 100644
--- a/desktop-widgets/mainwindow.cpp
+++ b/desktop-widgets/mainwindow.cpp
@@ -112,6 +112,7 @@ extern "C" void showErrorFromC(char *buf)
 }
 
 MainWindow::MainWindow() : QMainWindow(),
+	appState((ApplicationState)-1), // Invalid state
 	actionNextDive(nullptr),
 	actionPreviousDive(nullptr),
 #ifndef NO_USERMANUAL
@@ -653,8 +654,7 @@ void MainWindow::updateLastUsedDir(const QString &dir)
 void MainWindow::on_actionPrint_triggered()
 {
 #ifndef NO_PRINTING
-	bool in_planner = getAppState() == ApplicationState::PlanDive ||
-			  getAppState() == ApplicationState::EditPlannedDive;
+	bool in_planner = appState == ApplicationState::PlanDive || appState == ApplicationState::EditPlannedDive;
 	PrintDialog dlg(in_planner, this);
 
 	dlg.exec();
@@ -1132,7 +1132,7 @@ void MainWindow::writeSettings()
 	settings.setValue("geometry", saveGeometry());
 	settings.setValue("windowState", saveState());
 	settings.setValue("maximized", isMaximized());
-	settings.setValue("lastState", (int)getAppState());
+	settings.setValue("lastState", (int)appState);
 	saveSplitterSizes();
 	settings.endGroup();
 }
@@ -1562,14 +1562,14 @@ void MainWindow::on_actionFilterTags_triggered()
 {
 	if (!userMayChangeAppState())
 		return;
-	setApplicationState(getAppState() == ApplicationState::FilterDive ? ApplicationState::Default : ApplicationState::FilterDive);
+	setApplicationState(appState == ApplicationState::FilterDive ? ApplicationState::Default : ApplicationState::FilterDive);
 }
 
 void MainWindow::on_actionStats_triggered()
 {
 	if (!userMayChangeAppState())
 		return;
-	setApplicationState(getAppState() == ApplicationState::Statistics ? ApplicationState::Default : ApplicationState::Statistics);
+	setApplicationState(appState == ApplicationState::Statistics ? ApplicationState::Default : ApplicationState::Statistics);
 }
 
 void MainWindow::registerApplicationState(ApplicationState state, Quadrants q)
@@ -1602,17 +1602,17 @@ void MainWindow::setQuadrantWidgets(QSplitter &splitter, const Quadrant &left, c
 
 bool MainWindow::userMayChangeAppState() const
 {
-	return applicationState[(int)getAppState()].allowUserChange;
+	return applicationState[(int)appState].allowUserChange;
 }
 
 void MainWindow::setApplicationState(ApplicationState state)
 {
-	if (getAppState() == state)
+	if (appState == state)
 		return;
 
 	saveSplitterSizes();
 
-	setAppState(state);
+	appState = state;
 
 	clearSplitter(*topSplitter);
 	clearSplitter(*bottomSplitter);
diff --git a/desktop-widgets/mainwindow.h b/desktop-widgets/mainwindow.h
index ae8e11740..4b28c0a9e 100644
--- a/desktop-widgets/mainwindow.h
+++ b/desktop-widgets/mainwindow.h
@@ -19,7 +19,6 @@
 #include "ui_plannerDetails.h"
 #include "desktop-widgets/notificationwidget.h"
 #include "desktop-widgets/filterwidget.h"
-#include "core/applicationstate.h"
 #include "core/dive.h"
 #include "core/subsurface-qt/divelistnotifier.h"
 
@@ -53,6 +52,21 @@ public:
 	LocationInformationWidget *locationInformationWidget();
 	void setTitle();
 
+	enum class ApplicationState {
+		Default,
+		EditDive,
+		PlanDive,
+		EditPlannedDive,
+		EditDiveSite,
+		FilterDive,
+		Statistics,
+		MapMaximized,
+		ProfileMaximized,
+		ListMaximized,
+		InfoMaximized,
+		Count
+	};
+
 	void loadFiles(const QStringList files);
 	void importFiles(const QStringList importFiles);
 	void setToolButtonsEnabled(bool enabled);
@@ -155,6 +169,7 @@ slots:
 	void startDiveSiteEdit();
 
 private:
+	ApplicationState appState;
 	Ui::MainWindow ui;
 	FilterWidget filterWidget;
 	std::unique_ptr<QSplitter> topSplitter;
diff --git a/desktop-widgets/statswidget.cpp b/desktop-widgets/statswidget.cpp
index b74a26863..465d5d496 100644
--- a/desktop-widgets/statswidget.cpp
+++ b/desktop-widgets/statswidget.cpp
@@ -157,7 +157,7 @@ void StatsWidget::updateRestrictionLabel()
 
 void StatsWidget::closeStats()
 {
-	MainWindow::instance()->setApplicationState(ApplicationState::Default);
+	MainWindow::instance()->setApplicationState(MainWindow::ApplicationState::Default);
 }
 
 void StatsWidget::chartTypeChanged(int idx)