diff --git a/src/u_projinspect.pas b/src/u_projinspect.pas
index 02c52d4b..995d1159 100644
--- a/src/u_projinspect.pas
+++ b/src/u_projinspect.pas
@@ -292,6 +292,7 @@ procedure TProjectInspectWidget.projFocused(project: ICommonProject);
 begin
   fLastFileOrFolder := '';
   fProject := project;
+  TreeFilterEdit1.Text:= '';
   DetectNewDubSources(nil);
   updateButtons;
   if Visible then