diff --git a/src/Main/Base/Project/Src/Gui/Dialogs/TabbedOptionsDialog.xaml b/src/Main/Base/Project/Src/Gui/Dialogs/TabbedOptionsDialog.xaml
index baa10bc529..02af19dae7 100644
--- a/src/Main/Base/Project/Src/Gui/Dialogs/TabbedOptionsDialog.xaml
+++ b/src/Main/Base/Project/Src/Gui/Dialogs/TabbedOptionsDialog.xaml
@@ -4,6 +4,7 @@
 	x:Class="ICSharpCode.SharpDevelop.Gui.TabbedOptionsDialog"
 	Height="425"
 	Width="450"
+	WindowStartupLocation="CenterOwner"
 	Style="{x:Static core:GlobalStyles.DialogWindowStyle}">
 	<Grid Name="grid">
 		<Grid.RowDefinitions>
diff --git a/src/Main/Base/Project/Src/Gui/Dialogs/TreeViewOptionsDialog.xaml b/src/Main/Base/Project/Src/Gui/Dialogs/TreeViewOptionsDialog.xaml
index 2cc3cc5193..028ae3da0d 100644
--- a/src/Main/Base/Project/Src/Gui/Dialogs/TreeViewOptionsDialog.xaml
+++ b/src/Main/Base/Project/Src/Gui/Dialogs/TreeViewOptionsDialog.xaml
@@ -5,6 +5,7 @@
         Width="552"
         MinHeight="260"
         MinWidth="480"
+        WindowStartupLocation="CenterOwner"
         Style="{x:Static core:GlobalStyles.DialogWindowStyle}">
 	<Grid>
 		<Grid.RowDefinitions>