diff --git a/src/gui/symbology-ng/qgssymbollayerv2widget.cpp b/src/gui/symbology-ng/qgssymbollayerv2widget.cpp
index d9d831ecc3c..22a9b9acf0c 100644
--- a/src/gui/symbology-ng/qgssymbollayerv2widget.cpp
+++ b/src/gui/symbology-ng/qgssymbollayerv2widget.cpp
@@ -3344,6 +3344,7 @@ QgsGeometryGeneratorSymbolLayerWidget::QgsGeometryGeneratorSymbolLayerWidget( co
   setupUi( this );
   modificationExpressionSelector->setLayer( const_cast<QgsVectorLayer*>( vl ) );
   modificationExpressionSelector->loadFieldNames();
+  modificationExpressionSelector->setExpressionContext( _getExpressionContext( this ) );
   cbxGeometryType->addItem( QgsApplication::getThemeIcon( "/mIconPolygonLayer.svg" ), tr( "Polygon / MultiPolygon" ), QgsSymbolV2::Fill );
   cbxGeometryType->addItem( QgsApplication::getThemeIcon( "/mIconLineLayer.svg" ), tr( "LineString / MultiLineString" ), QgsSymbolV2::Line );
   cbxGeometryType->addItem( QgsApplication::getThemeIcon( "/mIconPointLayer.svg" ), tr( "Point / MultiPoint" ), QgsSymbolV2::Marker );