diff --git a/src/CalcViewModel/StandardCalculatorViewModel.cpp b/src/CalcViewModel/StandardCalculatorViewModel.cpp
index b035c14..a95199b 100644
--- a/src/CalcViewModel/StandardCalculatorViewModel.cpp
+++ b/src/CalcViewModel/StandardCalculatorViewModel.cpp
@@ -558,6 +558,7 @@ void StandardCalculatorViewModel::HandleUpdatedOperandData(Command cmdenum)
             length = m_selectedExpressionLastData->Length() + 1;
             if (length > 50)
             {
+                delete [] temp;
                 return;
             }
             for (; i < length; ++i)