diff --git a/MainWindow.cpp b/MainWindow.cpp
index 472a315..b6c3d74 100644
--- a/MainWindow.cpp
+++ b/MainWindow.cpp
@@ -263,6 +263,7 @@ void MainWindow::createLayout()
   sourceList = new QListWidget;
   sourceList->setSelectionMode(QAbstractItemView::SingleSelection);
   sourceList->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
+  sourceList->setMinimumWidth(SOURCE_LIST_MINIMUM_WIDTH);
 
   layerList = new QListWidget;
   layerList->setSelectionMode(QAbstractItemView::SingleSelection);
@@ -270,9 +271,11 @@ void MainWindow::createLayout()
   //layerList->setDragDropMode(QAbstractItemView::DragDrop);
   layerList->setDefaultDropAction(Qt::MoveAction);
   layerList->setDragDropMode(QAbstractItemView::InternalMove);
+  layerList->setMinimumWidth(LAYER_LIST_MINIMUM_WIDTH);
 
   propertyPanel = new QStackedWidget;
   propertyPanel->setDisabled(true);
+  propertyPanel->setMinimumWidth(PROPERTY_PANEL_MINIMUM_WIDTH);
 
   sourceCanvas = new SourceGLCanvas;
   destinationCanvas = new DestinationGLCanvas(0, sourceCanvas);
diff --git a/MainWindow.h b/MainWindow.h
index 9f18ea5..184f680 100644
--- a/MainWindow.h
+++ b/MainWindow.h
@@ -177,6 +177,9 @@ public:
   static const int DEFAULT_HEIGHT = 800;
   static const int SOURCE_LIST_ITEM_HEIGHT = 40;
   static const int SHAPE_LIST_ITEM_HEIGHT = 40;
+  static const int SOURCE_LIST_MINIMUM_WIDTH = 100;
+  static const int LAYER_LIST_MINIMUM_WIDTH  = 300;
+  static const int PROPERTY_PANEL_MINIMUM_WIDTH  = 400;
   static const int CANVAS_MINIMUM_WIDTH  = 480;
   static const int CANVAS_MINIMUM_HEIGHT = 270;
 };