diff --git a/src/meshlab/xmlstdpardialog.cpp b/src/meshlab/xmlstdpardialog.cpp
index 06c166522..e9d7d8195 100644
--- a/src/meshlab/xmlstdpardialog.cpp
+++ b/src/meshlab/xmlstdpardialog.cpp
@@ -523,7 +523,13 @@ void XMLStdParFrame::savePersistentParameterValue(QString name)
 	{
 		XMLMeshLabWidget* widg = it.value();
 		if (widg != nullptr)
-			emit savePersistentParameterValueRequested(name, widg->getWidgetExpression());
+		{
+			/*WARNING!!!! In order to be coherent with the scripting evaluation environment at the value of the XMLStringWidget a pair of double quotes is added at the beginning and at the end of the string*/
+			/*The best, and safest way to remove them (if they are not needed), is to let the scripting environment to evaluate the resulting string: Env e; QString st = e.evaluate(string_widg->getWidgetExpr).toString(); */
+			Env e;
+ 			QString expr = e.evaluate(widg->getWidgetExpression()).toString();
+			emit savePersistentParameterValueRequested(name,expr);
+		}
 	}
 }
 
@@ -831,6 +837,9 @@ void XMLStringWidget::updateVisibility( const bool vis )
 }
 
 
+/*WARNING!!!! In order to be coherent with the scripting evaluation environment at the value of the XMLStringWidget a pair of double quotes is added at the beginning and at the end of the string*/
+/*The best, and safest way to remove them (if they are not needed), is to let the scripting environment to evaluate the resulting string: Env e; QString st = e.evaluate(string_widg->getWidgetExpr).toString(); */
+
 QString XMLStringWidget::getWidgetExpression()
 {
     return QString("\"")+this->lineEdit->text()+QString("\"");
diff --git a/src/meshlab/xmlstdpardialog.h b/src/meshlab/xmlstdpardialog.h
index f6a220a1e..9312e5bf1 100644
--- a/src/meshlab/xmlstdpardialog.h
+++ b/src/meshlab/xmlstdpardialog.h
@@ -54,6 +54,7 @@ public:
     //virtual void collectWidgetValue() = 0;
     //void reset();
     virtual void set(const QString& nwExpStr) = 0;
+
     virtual QString getWidgetExpression() = 0;
     //virtual void updateWidget(const XMLFilterInfo::XMLMap& xmlWidgetTag) = 0;
     void setVisibility(const bool vis);
@@ -169,6 +170,10 @@ public:
     void set(const QString& nwExpStr);
     //void updateWidget(const XMLFilterInfo::XMLMap& xmlWidgetTag);
     void updateVisibility(const bool vis);
+
+	/*WARNING!!!! In order to be coherent with the scripting evaluation environment at the value of the XMLStringWidget a pair of double quotes is added at the beginning and at the end of the string*/
+	/*The best, and safest way to remove them (if they are not needed), is to let the scripting environment to evaluate the resulting string: Env e; QString st = e.evaluate(string_widg->getWidgetExpr).toString(); */
+
     QString getWidgetExpression();
 
     void addWidgetToGridLayout(QGridLayout* lay,const int r);