Index: src/core/qgsvectorlayer.cpp
===================================================================
--- src/core/qgsvectorlayer.cpp	(revision 12084)
+++ src/core/qgsvectorlayer.cpp	(working copy)
@@ -2318,6 +2318,9 @@ bool QgsVectorLayer::readSymbology( cons
 
   // use scale dependent visibility flag
   QDomElement e = node.toElement();
+  toggleScaleBasedVisibility( e.attribute( "scaleBasedVisibilityFlag", "0" ) == "1" );
+  setMinimumScale( e.attribute( "minScale", "1" ).toFloat() );
+  setMaximumScale( e.attribute( "maxScale", "100000000" ).toFloat() );
   label()->setScaleBasedVisibility( e.attribute( "scaleBasedLabelVisibilityFlag", "0" ) == "1" );
   label()->setMinScale( e.attribute( "minLabelScale", "1" ).toFloat() );
   label()->setMaxScale( e.attribute( "maxLabelScale", "100000000" ).toFloat() );
@@ -2465,6 +2468,9 @@ bool QgsVectorLayer::writeSymbology( QDo
 {
   // use scale dependent visibility flag
   QDomElement mapLayerNode = node.toElement();
+  mapLayerNode.setAttribute( "scaleBasedVisibilityFlag", hasScaleBasedVisibility() ? 1 : 0 );
+  mapLayerNode.setAttribute( "minScale", minimumScale() );
+  mapLayerNode.setAttribute( "maxScale", maximumScale() );
   mapLayerNode.setAttribute( "scaleBasedLabelVisibilityFlag", label()->scaleBasedVisibility() ? 1 : 0 );
   mapLayerNode.setAttribute( "minLabelScale", label()->minScale() );
   mapLayerNode.setAttribute( "maxLabelScale", label()->maxScale() );
Index: src/core/qgsmaplayer.h
===================================================================
--- src/core/qgsmaplayer.h	(revision 12084)
+++ src/core/qgsmaplayer.h	(working copy)
@@ -293,15 +293,15 @@ class CORE_EXPORT QgsMapLayer : public Q
 
     /** Accessor and mutator for the minimum scale member */
     void setMinimumScale( float theMinScale );
-    float minimumScale();
+    float minimumScale() const;
 
     /** Accessor and mutator for the maximum scale member */
     void setMaximumScale( float theMaxScale );
-    float maximumScale();
+    float maximumScale() const;
 
     /** Accessor and mutator for the scale based visilibility flag */
     void toggleScaleBasedVisibility( bool theVisibilityFlag );
-    bool hasScaleBasedVisibility();
+    bool hasScaleBasedVisibility() const;
 
   signals:
 
Index: src/core/qgsmaplayer.cpp
===================================================================
--- src/core/qgsmaplayer.cpp	(revision 12084)
+++ src/core/qgsmaplayer.cpp	(working copy)
@@ -385,7 +385,7 @@ void QgsMapLayer::toggleScaleBasedVisibi
   mScaleBasedVisibility = theVisibilityFlag;
 }
 
-bool QgsMapLayer::hasScaleBasedVisibility()
+bool QgsMapLayer::hasScaleBasedVisibility() const
 {
   return mScaleBasedVisibility;
 }
@@ -395,7 +395,7 @@ void QgsMapLayer::setMinimumScale( float
   mMinScale = theMinScale;
 }
 
-float QgsMapLayer::minimumScale()
+float QgsMapLayer::minimumScale() const
 {
   return mMinScale;
 }
@@ -406,7 +406,7 @@ void QgsMapLayer::setMaximumScale( float
   mMaxScale = theMaxScale;
 }
 
-float QgsMapLayer::maximumScale()
+float QgsMapLayer::maximumScale() const
 {
   return mMaxScale;
 }