diff --git a/src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/WebProjectOptions/WebProjectOptionsPanel.xaml.cs b/src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/WebProjectOptions/WebProjectOptionsPanel.xaml.cs
index c51d0d381e..094e177076 100644
--- a/src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/WebProjectOptions/WebProjectOptionsPanel.xaml.cs
+++ b/src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/WebProjectOptions/WebProjectOptionsPanel.xaml.cs
@@ -39,7 +39,7 @@ namespace ICSharpCode.SharpDevelop.Gui.OptionPanels
 				case WebServer.IISExpress:
 					if (WebProjectService.IISVersion == IISVersion.IISExpress) {
 						UseIISExpress.IsChecked = true;
-						PortTextBox.Text = CurrentProjectDebugData.Port;
+						PortTextBox.Text = CurrentProjectDebugData.Port ?? "8080";
 						
 						SelectIISExpress();
 					}