diff --git a/python/GafferUI/ColorChooser.py b/python/GafferUI/ColorChooser.py
index 3abd8ad7ef0..b191b252e92 100644
--- a/python/GafferUI/ColorChooser.py
+++ b/python/GafferUI/ColorChooser.py
@@ -130,6 +130,7 @@ def __init__( self, color, component, dynamicColors = False, **kw ) :
 		self.component = component
 		self.__dynamicColors = dynamicColors
 		self.__gradientToDraw = None
+		self.__size = self.size()
 
 	# Sets the slider color in RGB space for RGBA channels,
 	# HSV space for HSV channels and TMI space for TMI channels.
@@ -161,7 +162,7 @@ def _drawBackground( self, painter ) :
 
 		size = self.size()
 
-		if self.__gradientToDraw is None :
+		if self.__gradientToDraw is None or size != self.__size :
 			self.__gradientToDraw = QtGui.QLinearGradient( 0, 0, size.x, 0 )
 
 			displayTransform = self.displayTransform()
@@ -199,6 +200,7 @@ def _drawBackground( self, painter ) :
 
 		brush = QtGui.QBrush( self.__gradientToDraw )
 		painter.fillRect( 0, 0, size.x, size.y, brush )
+		self.__size = size
 
 	def _drawValue( self, painter, value, position, state ) :