diff --git a/src/Gui/Dialogs/DlgPreferencesImp.cpp b/src/Gui/Dialogs/DlgPreferencesImp.cpp
index d451d534e1..d5b539994e 100644
--- a/src/Gui/Dialogs/DlgPreferencesImp.cpp
+++ b/src/Gui/Dialogs/DlgPreferencesImp.cpp
@@ -365,18 +365,9 @@ int DlgPreferencesImp::minimumDialogWidth(int pageWidth) const
 {
     // this is additional safety spacing to ensure that everything fits with scrollbar etc.
     const auto additionalMargin = style()->pixelMetric(QStyle::PM_ScrollBarExtent) + 8;
-    
-    QSize size = ui->groupWidgetStack->sizeHint();
 
-    int diff = pageWidth - size.width();
-    int dw = width();
-
-    if (diff > 0) {
-        const int offset = 2;
-        dw += diff + offset;
-    }
-
-    return dw + additionalMargin;
+    QSize tree = ui->groupsTreeView->sizeHint();
+    return pageWidth + tree.width() + additionalMargin;
 }
 
 void DlgPreferencesImp::updatePageDependentWidgets()
@@ -908,7 +899,7 @@ void DlgPreferencesImp::onStackWidgetChange(int index)
         ui->groupsTreeView->expand(parentItem->index());
         parentItem->setExpanded(wasExpanded);
     }
-    
+
     ui->groupsTreeView->selectionModel()->select(currentIndex, QItemSelectionModel::ClearAndSelect);
 }