diff --git a/src/core/symbology/qgssymbol.cpp b/src/core/symbology/qgssymbol.cpp
index 2de0bef19028..d1c4399b91f1 100644
--- a/src/core/symbology/qgssymbol.cpp
+++ b/src/core/symbology/qgssymbol.cpp
@@ -1075,7 +1075,7 @@ void QgsSymbol::renderFeature( const QgsFeature &feature, QgsRenderContext &cont
 
       case QgsWkbTypes::MultiPoint:
       {
-        const QgsMultiPoint *mp = qgsgeometry_cast< const QgsMultiPoint * >( part );
+        const QgsMultiPoint *mp = qgsgeometry_cast< const QgsMultiPoint * >( processedGeometry );
         markers.reserve( mp->numGeometries() );
       }
       FALLTHROUGH
@@ -1083,7 +1083,7 @@ void QgsSymbol::renderFeature( const QgsFeature &feature, QgsRenderContext &cont
       case QgsWkbTypes::MultiLineString:
       case QgsWkbTypes::GeometryCollection:
       {
-        const QgsGeometryCollection *geomCollection = qgsgeometry_cast<const QgsGeometryCollection *>( part );
+        const QgsGeometryCollection *geomCollection = qgsgeometry_cast<const QgsGeometryCollection *>( processedGeometry );
 
         const unsigned int num = geomCollection->numGeometries();
         for ( unsigned int i = 0; i < num; ++i )
@@ -1107,7 +1107,7 @@ void QgsSymbol::renderFeature( const QgsFeature &feature, QgsRenderContext &cont
 
         QPolygonF pts;
 
-        const QgsGeometryCollection *geomCollection = dynamic_cast<const QgsGeometryCollection *>( part );
+        const QgsGeometryCollection *geomCollection = dynamic_cast<const QgsGeometryCollection *>( processedGeometry );
         const unsigned int num = geomCollection->numGeometries();
 
         // Sort components by approximate area (probably a bit faster than using