diff --git a/toonz/sources/tnztools/fullcolorbrushtool.cpp b/toonz/sources/tnztools/fullcolorbrushtool.cpp
index 1d01300..95a4e57 100644
--- a/toonz/sources/tnztools/fullcolorbrushtool.cpp
+++ b/toonz/sources/tnztools/fullcolorbrushtool.cpp
@@ -578,6 +578,8 @@ void FullColorBrushTool::setWorkAndBackupImages() {
 //------------------------------------------------------------------
 
 bool FullColorBrushTool::onPropertyChanged(std::string propertyName) {
+  if (m_propertyUpdating) return true;
+
   updateCurrentStyle();
 
   if (propertyName == "Preset:") {
@@ -587,7 +589,9 @@ bool FullColorBrushTool::onPropertyChanged(std::string propertyName) {
       loadLastBrush();
 
     FullcolorBrushPreset = m_preset.getValueAsString();
+    m_propertyUpdating   = true;
     getApplication()->getCurrentTool()->notifyToolChanged();
+    m_propertyUpdating = false;
     return true;
   }
 
@@ -605,7 +609,9 @@ bool FullColorBrushTool::onPropertyChanged(std::string propertyName) {
   if (m_preset.getValue() != CUSTOM_WSTR) {
     m_preset.setValue(CUSTOM_WSTR);
     FullcolorBrushPreset = m_preset.getValueAsString();
+    m_propertyUpdating   = true;
     getApplication()->getCurrentTool()->notifyToolChanged();
+    m_propertyUpdating = false;
   }
 
   return true;
diff --git a/toonz/sources/tnztools/fullcolorbrushtool.h b/toonz/sources/tnztools/fullcolorbrushtool.h
index b4df3c9..414aff9 100644
--- a/toonz/sources/tnztools/fullcolorbrushtool.h
+++ b/toonz/sources/tnztools/fullcolorbrushtool.h
@@ -122,6 +122,8 @@ protected:
   bool m_firstTime;
   bool m_mousePressed = false;
   TMouseEvent m_mouseEvent;
+
+  bool m_propertyUpdating = false;
 };
 
 //------------------------------------------------------------
diff --git a/toonz/sources/tnztools/toonzrasterbrushtool.cpp b/toonz/sources/tnztools/toonzrasterbrushtool.cpp
index ffb70f3..3009998 100644
--- a/toonz/sources/tnztools/toonzrasterbrushtool.cpp
+++ b/toonz/sources/tnztools/toonzrasterbrushtool.cpp
@@ -1936,14 +1936,18 @@ void ToonzRasterBrushTool::setWorkAndBackupImages() {
 //------------------------------------------------------------------
 
 bool ToonzRasterBrushTool::onPropertyChanged(std::string propertyName) {
+  if (m_propertyUpdating) return true;
+
   if (propertyName == m_preset.getName()) {
     if (m_preset.getValue() != CUSTOM_WSTR)
       loadPreset();
     else  // Chose <custom>, go back to last saved brush settings
       loadLastBrush();
 
-    RasterBrushPreset = m_preset.getValueAsString();
+    RasterBrushPreset  = m_preset.getValueAsString();
+    m_propertyUpdating = true;
     getApplication()->getCurrentTool()->notifyToolChanged();
+    m_propertyUpdating = false;
     return true;
   }
 
@@ -1980,8 +1984,10 @@ bool ToonzRasterBrushTool::onPropertyChanged(std::string propertyName) {
 
   if (m_preset.getValue() != CUSTOM_WSTR) {
     m_preset.setValue(CUSTOM_WSTR);
-    RasterBrushPreset = m_preset.getValueAsString();
+    RasterBrushPreset  = m_preset.getValueAsString();
+    m_propertyUpdating = true;
     getApplication()->getCurrentTool()->notifyToolChanged();
+    m_propertyUpdating = false;
   }
 
   return true;
diff --git a/toonz/sources/tnztools/toonzrasterbrushtool.h b/toonz/sources/tnztools/toonzrasterbrushtool.h
index ece7ca3..0e8eaef 100644
--- a/toonz/sources/tnztools/toonzrasterbrushtool.h
+++ b/toonz/sources/tnztools/toonzrasterbrushtool.h
@@ -223,6 +223,8 @@ protected:
   QElapsedTimer m_brushTimer;
   int m_minCursorThick, m_maxCursorThick;
 
+  bool m_propertyUpdating = false;
+
 protected:
   static void drawLine(const TPointD &point, const TPointD &centre,
                        bool horizontal, bool isDecimal);
diff --git a/toonz/sources/tnztools/toonzvectorbrushtool.cpp b/toonz/sources/tnztools/toonzvectorbrushtool.cpp
index bfaee36..2653acb 100644
--- a/toonz/sources/tnztools/toonzvectorbrushtool.cpp
+++ b/toonz/sources/tnztools/toonzvectorbrushtool.cpp
@@ -1438,6 +1438,8 @@ void ToonzVectorBrushTool::resetFrameRange() {
 //------------------------------------------------------------------
 
 bool ToonzVectorBrushTool::onPropertyChanged(std::string propertyName) {
+  if (m_propertyUpdating) return true;
+
   // Set the following to true whenever a different piece of interface must
   // be refreshed - done once at the end.
   bool notifyTool = false;
@@ -1449,7 +1451,9 @@ bool ToonzVectorBrushTool::onPropertyChanged(std::string propertyName) {
       loadLastBrush();
 
     V_VectorBrushPreset = m_preset.getValueAsString();
+    m_propertyUpdating  = true;
     getApplication()->getCurrentTool()->notifyToolChanged();
+    m_propertyUpdating = false;
     return true;
   }
 
@@ -1505,7 +1509,11 @@ bool ToonzVectorBrushTool::onPropertyChanged(std::string propertyName) {
     notifyTool          = true;
   }
 
-  if (notifyTool) getApplication()->getCurrentTool()->notifyToolChanged();
+  if (notifyTool) {
+    m_propertyUpdating = true;
+    getApplication()->getCurrentTool()->notifyToolChanged();
+    m_propertyUpdating = false;
+  }
 
   return true;
 }
diff --git a/toonz/sources/tnztools/toonzvectorbrushtool.h b/toonz/sources/tnztools/toonzvectorbrushtool.h
index 8978d8c..ea53182 100644
--- a/toonz/sources/tnztools/toonzvectorbrushtool.h
+++ b/toonz/sources/tnztools/toonzvectorbrushtool.h
@@ -197,6 +197,8 @@ protected:
 
   TPointD m_lastDragPos;        //!< Position where mouse was last dragged.
   TMouseEvent m_lastDragEvent;  //!< Previous mouse-drag event.
+
+  bool m_propertyUpdating = false;
 };
 
 #endif  // TOONZVECTORBRUSHTOOL_H