diff --git a/src/Mod/PartDesign/Gui/TaskThicknessParameters.cpp b/src/Mod/PartDesign/Gui/TaskThicknessParameters.cpp
index 74158f41fd..bac11329fe 100644
--- a/src/Mod/PartDesign/Gui/TaskThicknessParameters.cpp
+++ b/src/Mod/PartDesign/Gui/TaskThicknessParameters.cpp
@@ -104,7 +104,7 @@ TaskThicknessParameters::TaskThicknessParameters(ViewProviderDressUp *DressUpVie
     ui->modeComboBox->setCurrentIndex(mode);
 
     int join = pcThickness->Join.getValue();
-    ui->modeComboBox->setCurrentIndex(join);
+    ui->joinComboBox->setCurrentIndex(join);
 }
 
 void TaskThicknessParameters::onSelectionChanged(const Gui::SelectionChanges& msg)