diff --git a/src/core/symbology/qgslegendsymbolitem.cpp b/src/core/symbology/qgslegendsymbolitem.cpp
index 2abc74905839..ef545020fef5 100644
--- a/src/core/symbology/qgslegendsymbolitem.cpp
+++ b/src/core/symbology/qgslegendsymbolitem.cpp
@@ -59,6 +59,7 @@ QgsLegendSymbolItem &QgsLegendSymbolItem::operator=( const QgsLegendSymbolItem &
   mScaleMaxDenom = other.mScaleMaxDenom;
   mLevel = other.mLevel;
   mParentKey = other.mParentKey;
+  mUserData = other.mUserData;
 
   return *this;
 }