diff --git a/CPF/Controls/TextBlock.cs b/CPF/Controls/TextBlock.cs
index 433739a..996c79d 100644
--- a/CPF/Controls/TextBlock.cs
+++ b/CPF/Controls/TextBlock.cs
@@ -282,6 +282,7 @@ namespace CPF.Controls
             }
             else
             {
+                textSize = new Size();
                 return base.ArrangeOverride(finalSize);
             }
         }