diff --git a/SandboxiePlus/SandMan/SbiePlusAPI.cpp b/SandboxiePlus/SandMan/SbiePlusAPI.cpp
index 17fb623b..36db6fc9 100644
--- a/SandboxiePlus/SandMan/SbiePlusAPI.cpp
+++ b/SandboxiePlus/SandMan/SbiePlusAPI.cpp
@@ -236,8 +236,11 @@ void CSandBoxPlus::UpdateSize()
 
 void CSandBoxPlus::SetSize(quint64 Size)
 { 
-	m_TotalSize = Size; 
-	theConf->SetValue("SizeCache/" + m_Name, Size);
+	m_TotalSize = Size;
+	if (m_TotalSize == 0)
+		theConf->DelValue("SizeCache/" + m_Name);
+	else
+		theConf->SetValue("SizeCache/" + m_Name, Size);
 }
 
 bool CSandBoxPlus::IsSizePending() const
diff --git a/SandboxiePlus/SandMan/Views/SbieView.cpp b/SandboxiePlus/SandMan/Views/SbieView.cpp
index d9bb7f6b..826f7559 100644
--- a/SandboxiePlus/SandMan/Views/SbieView.cpp
+++ b/SandboxiePlus/SandMan/Views/SbieView.cpp
@@ -1208,6 +1208,7 @@ void CSbieView::OnSandBoxAction(QAction* Action, const QList<CSandBoxPtr>& SandB
 		Results.append((SandBoxes.first()->RenameBox(Value)));
 
 		RenameItem(OldValue, Value);
+		theConf->DelValue("SizeCache/" + OldValue);
 	}
 	else if (Action == m_pMenuRecover)
 	{
@@ -1232,7 +1233,7 @@ void CSbieView::OnSandBoxAction(QAction* Action, const QList<CSandBoxPtr>& SandB
 				if (I.value().removeOne(pBox->GetName()))
 					break;
 			}
-		}	
+		}
 	}
 	else if (Action == m_pMenuCleanUp)
 	{