diff --git a/BuildScripts/MakeInternal.ps1 b/BuildScripts/MakeInternal.ps1
index 10dbf547..a10374a5 100644
--- a/BuildScripts/MakeInternal.ps1
+++ b/BuildScripts/MakeInternal.ps1
@@ -4,7 +4,8 @@ $inputFiles = @(
     ".\src\FastExpressionCompiler\ILReader.cs",
     ".\src\FastExpressionCompiler\TestTools.cs",
     ".\src\FastExpressionCompiler.LightExpression\Expression.cs",
-    ".\src\FastExpressionCompiler.LightExpression\ExpressionVisitor.cs"
+    ".\src\FastExpressionCompiler.LightExpression\ExpressionVisitor.cs",
+    ".\src\FastExpressionCompiler.LightExpression\FlatExpression.cs"
 )
 $outputFolder = ".\src\FastExpressionCompiler.Internal"
 
diff --git a/nuspecs/FastExpressionCompiler.LightExpression.Internal.src.nuspec b/nuspecs/FastExpressionCompiler.LightExpression.Internal.src.nuspec
index b972d6b6..14bbda28 100644
--- a/nuspecs/FastExpressionCompiler.LightExpression.Internal.src.nuspec
+++ b/nuspecs/FastExpressionCompiler.LightExpression.Internal.src.nuspec
@@ -158,6 +158,7 @@ https://github.com/dadhi/FastExpressionCompiler/compare/v5.3.3...v5.4.0
         <file src="..\src\FastExpressionCompiler.Internal\TestTools.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\Expression.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\ExpressionVisitor.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
+        <file src="..\src\FastExpressionCompiler.Internal\FlatExpression.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
 
         <file src="..\src\FastExpressionCompiler.Internal\FastExpressionCompiler.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\ImTools.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
@@ -165,6 +166,7 @@ https://github.com/dadhi/FastExpressionCompiler/compare/v5.3.3...v5.4.0
         <file src="..\src\FastExpressionCompiler.Internal\TestTools.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\Expression.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\ExpressionVisitor.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
+        <file src="..\src\FastExpressionCompiler.Internal\FlatExpression.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
 
         <file src="..\src\FastExpressionCompiler.Internal\FastExpressionCompiler.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\ImTools.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
@@ -172,6 +174,7 @@ https://github.com/dadhi/FastExpressionCompiler/compare/v5.3.3...v5.4.0
         <file src="..\src\FastExpressionCompiler.Internal\TestTools.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\Expression.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.Internal\ExpressionVisitor.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
+        <file src="..\src\FastExpressionCompiler.Internal\FlatExpression.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
 
     </files>
 </package>
diff --git a/nuspecs/FastExpressionCompiler.LightExpression.src.nuspec b/nuspecs/FastExpressionCompiler.LightExpression.src.nuspec
index 4f44847d..f4b7d82b 100644
--- a/nuspecs/FastExpressionCompiler.LightExpression.src.nuspec
+++ b/nuspecs/FastExpressionCompiler.LightExpression.src.nuspec
@@ -158,6 +158,7 @@ https://github.com/dadhi/FastExpressionCompiler/compare/v5.3.3...v5.4.0
         <file src="..\src\FastExpressionCompiler\TestTools.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.LightExpression\Expression.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.LightExpression\ExpressionVisitor.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
+        <file src="..\src\FastExpressionCompiler.LightExpression\FlatExpression.cs" target="contentFiles\cs\net472\FastExpressionCompiler.LightExpression" />
 
         <file src="..\src\FastExpressionCompiler\FastExpressionCompiler.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler\ImTools.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
@@ -165,6 +166,7 @@ https://github.com/dadhi/FastExpressionCompiler/compare/v5.3.3...v5.4.0
         <file src="..\src\FastExpressionCompiler\TestTools.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.LightExpression\Expression.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.LightExpression\ExpressionVisitor.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
+        <file src="..\src\FastExpressionCompiler.LightExpression\FlatExpression.cs" target="contentFiles\cs\netstandard2.0\FastExpressionCompiler.LightExpression" />
 
         <file src="..\src\FastExpressionCompiler\FastExpressionCompiler.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler\ImTools.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
@@ -172,6 +174,7 @@ https://github.com/dadhi/FastExpressionCompiler/compare/v5.3.3...v5.4.0
         <file src="..\src\FastExpressionCompiler\TestTools.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.LightExpression\Expression.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
         <file src="..\src\FastExpressionCompiler.LightExpression\ExpressionVisitor.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
+        <file src="..\src\FastExpressionCompiler.LightExpression\FlatExpression.cs" target="contentFiles\cs\net8.0\FastExpressionCompiler.LightExpression" />
 
     </files>
 </package>