diff --git a/src/CalcManager/CEngine/History.cpp b/src/CalcManager/CEngine/History.cpp
index 283b1dce..7f4fd772 100644
--- a/src/CalcManager/CEngine/History.cpp
+++ b/src/CalcManager/CEngine/History.cpp
@@ -6,13 +6,27 @@
 #include "Command.h"
 #include "CalculatorVector.h"
 #include "ExpressionCommand.h"
-#include "CalcException.h"
 
 constexpr int ASCII_0 = 48;
 
 using namespace std;
 using namespace CalcEngine;
 
+class CalcException : public std::exception
+{
+public:
+    CalcException(HRESULT hr)
+    {
+        m_hr = hr;
+    }
+    HRESULT GetException()
+    {
+        return m_hr;
+    }
+private:
+    HRESULT m_hr;
+};
+
 namespace {
     void IFT(HRESULT hr)
     {
diff --git a/src/CalcManager/CalcException.h b/src/CalcManager/CalcException.h
deleted file mode 100644
index 5b7237d9..00000000
--- a/src/CalcManager/CalcException.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-class CalcException : public std::exception
-{
-public:
-    CalcException(HRESULT hr)
-    {
-        m_hr = hr;
-    }
-    HRESULT GetException()
-    {
-        return m_hr;
-    }
-private:
-    HRESULT m_hr;
-};
diff --git a/src/CalcManager/CalcManager.vcxproj.filters b/src/CalcManager/CalcManager.vcxproj.filters
index 9be2a455..2ca11666 100644
--- a/src/CalcManager/CalcManager.vcxproj.filters
+++ b/src/CalcManager/CalcManager.vcxproj.filters
@@ -119,7 +119,6 @@
     <ClInclude Include="Ratpack\ratpak.h">
       <Filter>RatPack</Filter>
     </ClInclude>
-    <ClInclude Include="CalcException.h" />
     <ClInclude Include="CalculatorVector.h" />
     <ClInclude Include="Header Files\CalcEngine.h">
       <Filter>Header Files</Filter>
@@ -162,4 +161,4 @@
       <Filter>Header Files</Filter>
     </ClInclude>
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>