diff --git a/toonz/sources/tnztools/tooloptionscontrols.cpp b/toonz/sources/tnztools/tooloptionscontrols.cpp
index ece372e..c62dbed 100644
--- a/toonz/sources/tnztools/tooloptionscontrols.cpp
+++ b/toonz/sources/tnztools/tooloptionscontrols.cpp
@@ -114,6 +114,14 @@ void ToolOptionCheckbox::updateStatus() {
 
 //-----------------------------------------------------------------------------
 
+void ToolOptionCheckbox::nextCheckState() {
+  QAbstractButton::nextCheckState();
+  m_property->setValue(checkState() == Qt::Checked);
+  notifyTool();
+}
+
+//-----------------------------------------------------------------------------
+
 void ToolOptionCheckbox::doClick(bool checked) {
   if (m_toolHandle && m_toolHandle->getTool() != m_tool) return;
   // active only if the belonging combo-viewer is visible
diff --git a/toonz/sources/tnztools/tooloptionscontrols.h b/toonz/sources/tnztools/tooloptionscontrols.h
index b446e88..c55f417 100644
--- a/toonz/sources/tnztools/tooloptionscontrols.h
+++ b/toonz/sources/tnztools/tooloptionscontrols.h
@@ -94,6 +94,9 @@ public:
   void updateStatus() override;
 public slots:
   void doClick(bool);
+
+protected:
+  void nextCheckState() override;
 };
 
 //-----------------------------------------------------------------------------