diff --git a/src/gui/piano_roll.cpp b/src/gui/piano_roll.cpp
index 0674e53bb..d41e5b095 100644
--- a/src/gui/piano_roll.cpp
+++ b/src/gui/piano_roll.cpp
@@ -76,7 +76,6 @@ extern Keys whiteKeys[];	// defined in piano_widget.cpp
 
 
 // some constants...
-const int INITIAL_PIANOROLL_WIDTH = 840;
 const int INITIAL_PIANOROLL_HEIGHT = 480;
 
 const int SCROLLBAR_SIZE = 16;
@@ -600,13 +599,13 @@ pianoRoll::pianoRoll() :
 	if( engine::mainWindow()->workspace() )
 	{
 		engine::mainWindow()->workspace()->addSubWindow( this );
-		parentWidget()->resize( INITIAL_PIANOROLL_WIDTH,
+		parentWidget()->resize( tb_layout->minimumSize().width(),
 						INITIAL_PIANOROLL_HEIGHT );
 		parentWidget()->hide();
 	}
 	else
 	{
-		resize( INITIAL_PIANOROLL_WIDTH, INITIAL_PIANOROLL_HEIGHT );
+		resize( tb_layout->minimumSize().width(), INITIAL_PIANOROLL_HEIGHT );
 		hide();
 	}