diff --git a/src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Pads/RunningThreadsPad.cs b/src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Pads/RunningThreadsPad.cs
index 72b5b452c9..c9dd381fe7 100644
--- a/src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Pads/RunningThreadsPad.cs
+++ b/src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Pads/RunningThreadsPad.cs
@@ -80,7 +80,7 @@ namespace ICSharpCode.SharpDevelop.Gui.Pads
 				debuggedProcess.DebuggeeStateChanged += debuggedProcess_DebuggeeStateChanged;
 				debuggedProcess.ThreadStarted        += debuggedProcess_ThreadStarted;
 			}
-			runningThreadsList.Clear();
+			runningThreadsList.Items.Clear();
 			RefreshPad();
 		}