diff --git a/kmplot/functioneditor.h b/kmplot/functioneditor.h
--- a/kmplot/functioneditor.h
+++ b/kmplot/functioneditor.h
@@ -95,6 +95,10 @@
 		 */
 		void save();
 		/**
+		 * Called when the user ticks or unticks an item in the function list.
+		 */
+		void saveItem(QListWidgetItem *item);
+		/**
 		 * Updates the list of functions (called when a function is added or
 		 * removed from Parser).
 		 */
diff --git a/kmplot/functioneditor.cpp b/kmplot/functioneditor.cpp
--- a/kmplot/functioneditor.cpp
+++ b/kmplot/functioneditor.cpp
@@ -117,7 +117,7 @@
 	
 	connect(m_editor->deleteButton, &QPushButton::clicked, this, &FunctionEditor::deleteCurrent);
 	connect(m_functionList, &FunctionListWidget::currentItemChanged, this, &FunctionEditor::functionSelected);
-	connect(m_functionList, &FunctionListWidget::itemClicked, this, &FunctionEditor::save);
+	connect(m_functionList, &FunctionListWidget::itemClicked, this, &FunctionEditor::saveItem);
 	
 	//BEGIN connect up all editing widgets
 #define CONNECT_WIDGETS( name, signal ) \
@@ -544,6 +544,22 @@
 	m_saveTimer[ f->type() ]->start( 0 );
 }
 
+void FunctionEditor::saveItem(QListWidgetItem *item)
+{
+	if (item != m_functionList->currentItem())
+	{
+		m_functionList->setCurrentItem(item);
+		if (item->checkState() == Qt::Checked)
+		{
+			item->setCheckState(Qt::Unchecked);
+		} else
+		{
+			item->setCheckState(Qt::Checked);
+		}
+	}
+
+	save();
+}
 
 void FunctionEditor::saveCartesian()
 {