diff --git a/modules/hist2d/TGraphPainter.mjs b/modules/hist2d/TGraphPainter.mjs
index 17b6c5e34..3139c75e4 100644
--- a/modules/hist2d/TGraphPainter.mjs
+++ b/modules/hist2d/TGraphPainter.mjs
@@ -1396,7 +1396,7 @@ class TGraphPainter extends ObjectPainter {
       return false;
    }
 
-   /** @summary Update object members
+   /** @summary Update TGraph object members
      * @private */
    _updateMembers(graph, obj) {
       graph.fBits = obj.fBits;
@@ -1423,6 +1423,8 @@ class TGraphPainter extends ObjectPainter {
          graph.fMarkerColor = obj.fMarkerColor;
       graph.fMarkerSize = obj.fMarkerSize;
       graph.fMarkerStyle = obj.fMarkerStyle;
+
+      return obj.fFunctions;
    }
 
    /** @summary Update TGraph object */
@@ -1432,7 +1434,7 @@ class TGraphPainter extends ObjectPainter {
       if (opt && (opt !== this.options.original))
          this.decodeOptions(opt);
 
-      this._updateMembers(this.getObject(), obj);
+      const new_funcs = this._updateMembers(this.getObject(), obj);
 
       this.createBins();
 
@@ -1448,7 +1450,7 @@ class TGraphPainter extends ObjectPainter {
          }
       }
 
-      this._funcHandler = new FunctionsHandler(this, this.getPadPainter(), obj.fFunctions);
+      this._funcHandler = new FunctionsHandler(this, this.getPadPainter(), new_funcs);
 
       return true;
    }
diff --git a/modules/hist2d/TScatterPainter.mjs b/modules/hist2d/TScatterPainter.mjs
index e1e72b395..24f1752ed 100644
--- a/modules/hist2d/TScatterPainter.mjs
+++ b/modules/hist2d/TScatterPainter.mjs
@@ -45,7 +45,8 @@ class TScatterPainter extends TGraphPainter {
       return pal;
    }
 
-   /** @summary Update TScatter members */
+   /** @summary Update TScatter members
+    * @private */
    _updateMembers(scatter, obj) {
       scatter.fBits = obj.fBits;
       scatter.fTitle = obj.fTitle;
@@ -55,7 +56,7 @@ class TScatterPainter extends TGraphPainter {
       scatter.fMargin = obj.fMargin;
       scatter.fMinMarkerSize = obj.fMinMarkerSize;
       scatter.fMaxMarkerSize = obj.fMaxMarkerSize;
-      super._updateMembers(scatter.fGraph, obj.fGraph);
+      return super._updateMembers(scatter.fGraph, obj.fGraph);
    }
 
    /** @summary Return Z axis used for palette drawing